Lesson 02: HTML Basic Examples: Documents, Headings, Paragraphs, Links & Images

Phase 1 of 11

Lesson Introduction

Welcome to Lesson 2! In the previous lesson you learned what HTML is and how to set up your editor. Now it is time to write your very first real HTML code.

By the end of this lesson you will be able to:

Understand the skeleton of every HTML document
Use the <!DOCTYPE> declaration and know exactly why it exists
Create headings of different sizes using <h1> through <h6>
Write paragraphs using the <p> tag
Build clickable links using the <a> tag and the href attribute
Display images using the <img> tag and its key attributes
View the hidden HTML source code of any website in your browser

Think of this lesson as learning to read a recipe card before cooking. Every web page you will ever build follows the same basic structure you will learn right here.

Real-world connection: Every website you use every day · news sites, social media, school portals, e-commerce stores · is built on exactly the foundation you are about to learn.

✏️ Your Task

Practise what you just learned about Lesson Introduction. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 2 of 11

Prerequisite Concepts

Before we dive into examples, let us make sure you understand two ideas that are used throughout this lesson.

What is an HTML Tag?

An HTML tag is a special keyword wrapped inside angle brackets < >. Tags tell the browser what kind of content is coming.

Most tags come in pairs:

An opening tag starts the content: <tagname>
A closing tag ends the content: </tagname> ← notice the forward slash /

html

<p>This is a paragraph.</p>

Here:

<p> is the opening tag · it says "a paragraph starts here"
This is a paragraph. is the content
</p> is the closing tag · it says "the paragraph ends here"

Think of tags like a sandwich: the opening and closing tags are the two slices of bread, and the content is the filling in between.

What is an HTML Attribute?

An attribute gives extra information to a tag. It always goes inside the opening tag, written as name="value".

html

<a href="https://www.google.com">Visit Google</a>

Here:

<a> is the tag (used for links)
href="https://www.google.com" is an attribute · it tells the browser where the link goes
Visit Google is the clickable text the user sees
</a> closes the link

You do not need to memorise all attributes right now. You will learn the most important ones naturally as you work through each concept.

✏️ Your Task

Practise what you just learned about Prerequisite Concepts. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 3 of 11

Part 1 · The HTML Document Structure

What Is an HTML Document?

An HTML document is just a plain text file that follows a specific set of rules. When your browser opens it, it reads those rules and draws the web page on your screen.

Think of it like this: a book has a cover, a table of contents, and chapters. An HTML document has its own required parts too.

Every complete HTML document must have these three things:

A document type declaration at the very top
An opening and closing <html> tag that wraps everything
A <body> tag that holds all the content the user sees

The `<!DOCTYPE html>` Declaration

What is it?

<!DOCTYPE html> is a special instruction at the very top of every HTML file. It is not an HTML tag · it is a declaration.

Why does it exist?

In the early days of the web, there were many different versions of HTML, and browsers sometimes displayed them differently. The <!DOCTYPE> tells the browser: "This file uses the modern HTML5 standard. Please display it correctly."

Without it, some older browsers might go into a strange mode called "quirks mode" and display your page incorrectly · things might look broken or misaligned.

Rules to remember

It must appear once only, at the very top of the file · before everything else
It is not case sensitive · <!DOCTYPE html>, <!doctype html>, and <!Doctype HTML> all work
For modern HTML5 (which is what everyone uses today), it is simply: <!DOCTYPE html>

Simple example

html

<!DOCTYPE html>

Expected output: Nothing visible on the page · it is purely an instruction for the browser, not content for the user.

Thinking prompt: What do you think would happen if you put <!DOCTYPE html> in the middle of your file instead of the top? Answer: Browsers would likely still work, but it is bad practice. Other tools and validators would reject your code as invalid.

The Full HTML Document Skeleton

Now let us look at the complete, minimum structure every valid HTML document must have:

html

<!DOCTYPE html>
<html>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>

Let us go through every single line:

Line	Code	What it does
1	`<!DOCTYPE html>`	Tells the browser this is HTML5
2	`<html>`	Opens the HTML document · everything lives inside here
3	`<body>`	Opens the body · all visible content goes here
4	`<h1>My First Heading</h1>`	A large heading (you will learn more in the next section)
5	`<p>My first paragraph.</p>`	A paragraph of text
6	`</body>`	Closes the body section
7	`</html>`	Closes the entire HTML document

Expected output in browser:

code

My First Heading        ← displayed large and bold
My first paragraph.     ← displayed as normal-sized text below

Analogy: The <html> tag is like the walls of a house · everything must be inside them. The <body> tag is like the living room · it holds everything the visitor sees when they walk in.

Why is the `<body>` tag needed?

HTML documents actually have two main sections:

<head> · Contains invisible information about the page (title, settings, links to style files). The user does not see this directly.
<body> · Contains everything the user sees and interacts with on the page.

In this lesson we are focusing entirely on what goes inside <body>. The <head> section will be covered in a later lesson.

✏️ Your Task

Practise what you just learned about The HTML Document Structure. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 4 of 11

Part 2 · HTML Headings

What are Headings?

Headings are titles and subtitles. Just like a newspaper has a big bold headline at the top, then smaller sub-headlines for each section, HTML gives you six levels of headings.

HTML headings use the tags <h1> through <h6>:

<h1> = the biggest, most important heading (like the title of the whole page)
<h2> = a major section heading
<h3> = a subsection under h2
<h4>, <h5>, <h6> = progressively smaller and less important headings

Why do headings matter?

Headings are not just for making text big. They serve two critical purposes:

Readability · They help users quickly scan and understand the structure of a page.
SEO (Search Engine Optimisation) · Search engines like Google read your headings to understand what your page is about. A good <h1> helps Google rank your page correctly.

Simple Example · All Six Heading Levels

html

<!DOCTYPE html>
<html>
<body>

<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>

</body>
</html>

Expected output in browser:

code

This is heading 1    ← very large, bold
This is heading 2    ← slightly smaller, bold
This is heading 3    ← medium size, bold
This is heading 4    ← smaller, bold
This is heading 5    ← even smaller, bold
This is heading 6    ← smallest, bold

Each heading automatically appears on its own line, and the browser adds space above and below it.

Second Example · Using Headings Like a Real Web Page

Here is how headings work in a real-world context · imagine a science article:

html

<!DOCTYPE html>
<html>
<body>

<h1>The Solar System</h1>

<h2>Inner Planets</h2>
<h3>Mercury</h3>
<h3>Venus</h3>
<h3>Earth</h3>

<h2>Outer Planets</h2>
<h3>Jupiter</h3>
<h3>Saturn</h3>

</body>
</html>

Expected output in browser:

code

The Solar System              ← biggest heading (page title)

  Inner Planets               ← medium heading (section)
    Mercury                   ← smaller heading (subsection)
    Venus
    Earth

  Outer Planets
    Jupiter
    Saturn

Thinking prompt: Why should there only be ONE <h1> per page? Think about the title of a book · a book has one title, not five.

Common Beginner Mistake with Headings

Mistake: Using <h1> just because you want big text, not because it is the page title.

html

<!-- WRONG: Using h1 just to make text big -->
<h1>Welcome!</h1>
<h1>About Us</h1>
<h1>Contact</h1>

Why this is wrong: Every section is now equally the "most important thing" on the page, which confuses both users and search engines.

html

<!-- CORRECT: One h1 for the title, then h2 for sections -->
<h1>My Business Website</h1>
<h2>Welcome!</h2>
<h2>About Us</h2>
<h2>Contact</h2>

Expected output: My Business Website appears as the largest heading, with Welcome!, About Us, and Contact appearing slightly smaller beneath it.

✏️ Your Task

Practise what you just learned about HTML Headings. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 5 of 11

Part 3 · HTML Paragraphs

What is the `<p>` Tag?

The <p> tag defines a paragraph of text. Every time you use <p>...</p>, the browser automatically:

Puts the content on a new line
Adds space above and below it (called a margin)

This means paragraphs are automatically separated from each other, even without you pressing Enter multiple times.

Simple Example · Two Paragraphs

html

<!DOCTYPE html>
<html>
<body>

<p>This is a paragraph.</p>
<p>This is another paragraph.</p>

</body>
</html>

Expected output in browser:

code

This is a paragraph.

This is another paragraph.

Notice the gap between the two paragraphs · the browser added that automatically.

Second Example · Paragraphs in a Real Context

html

<!DOCTYPE html>
<html>
<body>

<h1>About Lagos</h1>

<p>Lagos is the largest city in Nigeria and one of the most populous cities in Africa.</p>

<p>It is a major financial centre and home to a vibrant culture, with world-class music, art, and cuisine.</p>

<p>The city sits on the Atlantic Ocean and is known for its bustling markets and creative industries.</p>

</body>
</html>

Expected output in browser:

code

About Lagos

Lagos is the largest city in Nigeria and one of the most
populous cities in Africa.

It is a major financial centre and home to a vibrant culture,
with world-class music, art, and cuisine.

The city sits on the Atlantic Ocean and is known for its
bustling markets and creative industries.

Common Beginner Mistake with Paragraphs

Mistake 1: Trying to create space by pressing Enter inside HTML code.

html

<!-- WRONG: Pressing Enter does NOT create a new paragraph -->
<p>First line
Second line</p>

What the browser actually shows:

code

First line Second line

The browser ignores extra line breaks inside HTML code. You must use a new <p> tag.

html

<!-- CORRECT: Use separate p tags for separate paragraphs -->
<p>First paragraph.</p>
<p>Second paragraph.</p>

Mistake 2: Forgetting to close the <p> tag.

html

<!-- RISKY: Missing closing tag -->
<p>This paragraph has no closing tag.
<p>This is the second paragraph.

While browsers are forgiving and may still display this, it is bad practice and can cause layout problems on complex pages. Always close your tags.

✏️ Your Task

Practise what you just learned about HTML Paragraphs. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 6 of 11

Part 4 · HTML Links

What is the `<a>` Tag?

The <a> tag creates a hyperlink · a piece of clickable text (or image) that takes the user to another page or website.

<a> stands for anchor. Think of a ship's anchor: it connects the ship to a fixed point. An HTML anchor connects your page to another destination.

The `href` Attribute

The href attribute (short for Hypertext REFerence) holds the URL (the web address) that the link goes to.

html

<a href="https://www.w3schools.com">This is a link</a>

Breaking this down word by word:

Part	Meaning
`<a`	Opens the anchor tag
`href=`	Says "the destination of this link is..."
`"https://www.w3schools.com"`	The URL · where the link goes when clicked
`>`	Closes the opening tag
`This is a link`	The clickable text the user sees
`</a>`	Closes the anchor tag

Expected output in browser:

code

This is a link    ← shown in blue with an underline (default browser style)

When you click it, the browser navigates to https://www.w3schools.com.

Real-world connection: Every "Click here", "Read more", "Buy now", or "Download" button you have ever clicked on any website is built with the <a> tag.

Simple Example · A Basic Link

html

<!DOCTYPE html>
<html>
<body>

<p>Visit my favourite website:</p>
<a href="https://www.google.com">Go to Google</a>

</body>
</html>

Expected output:

code

Visit my favourite website:
Go to Google    ← blue, underlined, clickable

Second Example · Multiple Links

html

<!DOCTYPE html>
<html>
<body>

<h1>Useful Websites</h1>

<p><a href="https://www.google.com">Google</a> - Search engine</p>
<p><a href="https://www.wikipedia.org">Wikipedia</a> - Free encyclopedia</p>
<p><a href="https://www.w3schools.com">W3Schools</a> - Learn web development</p>

</body>
</html>

Expected output:

code

Useful Websites

Google - Search engine
Wikipedia - Free encyclopedia
W3Schools - Learn web development

(Google, Wikipedia, and W3Schools each appear as clickable blue links.)

Thinking prompt: What do you think happens if you leave out the href attribute? Try it! You will get a link that looks like normal text · it is not clickable because there is no destination.

Common Beginner Mistakes with Links

Mistake 1: Forgetting https:// at the start of the URL.

html

<!-- WRONG -->
<a href="www.google.com">Google</a>

<!-- CORRECT -->
<a href="https://www.google.com">Google</a>

Without https://, the browser treats it as a relative path · it looks for a file called www.google.com in the same folder as your HTML file, not on the internet.

Mistake 2: Putting the URL outside the quotes.

html

<!-- WRONG -->
<a href=https://www.google.com>Google</a>

<!-- CORRECT -->
<a href="https://www.google.com">Google</a>

Always wrap attribute values in double quotes.

✏️ Your Task

Practise what you just learned about HTML Links. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 7 of 11

Part 5 · HTML Images

What is the `<img>` Tag?

The <img> tag displays an image on your web page.

Important: <img> is a self-closing tag · it has no closing tag. This is because it has no "content" between tags; it simply embeds a file.

html

<img src="w3schools.jpg" alt="W3Schools Logo" width="104" height="142">

Let us break down every attribute:

Attribute	What it does	Example value
`src`	The source · the file name or URL of the image	`"photo.jpg"` or `"https://example.com/img.png"`
`alt`	Alternative text · describes the image in words	`"A smiling dog"`
`width`	Sets the width of the image in pixels	`"200"`
`height`	Sets the height of the image in pixels	`"150"`

Why is `alt` Text So Important?

The alt attribute serves three critical purposes:

Accessibility: Screen readers (used by visually impaired users) read the alt text aloud so the user understands what the image shows.
Broken images: If the image file cannot be found (e.g. wrong file name), the browser displays the alt text instead so the user knows what was supposed to be there.
SEO: Search engines cannot "see" images, so they read the alt text to understand what the image is about.

Analogy: The alt attribute is like a label on a jar. Even if the jar is empty (image not loading), the label tells you what was supposed to be inside.

Simple Example · Displaying a Local Image

html

<!DOCTYPE html>
<html>
<body>

<img src="cat.jpg" alt="A fluffy orange cat" width="300" height="200">

</body>
</html>

Expected output:

code

[A photo of a fluffy orange cat, 300 pixels wide and 200 pixels tall]

(If cat.jpg is saved in the same folder as your HTML file, it will appear. If not, the text A fluffy orange cat appears in its place.)

Second Example · Image from the Internet

You can also use a full web address (URL) for the src:

html

<!DOCTYPE html>
<html>
<body>

<h1>My Favourite Animal</h1>

<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/320px-Cat03.jpg"
     alt="A cat sitting on a surface"
     width="320"
     height="214">

<p>Cats are one of the most popular pets in the world.</p>

</body>
</html>

Expected output:

code

My Favourite Animal

[Photo of a cat]

Cats are one of the most popular pets in the world.

Thinking prompt: What happens if you change the width to 600 but keep height at 214? Try it! The image will look stretched horizontally. To avoid distortion, you can set only width and leave height out · the browser will scale it proportionally.

Common Beginner Mistakes with Images

Mistake 1: Wrong file name or wrong path.

html

<!-- WRONG: File name is wrong -->
<img src="Cat.jpg" alt="A cat">

<!-- If the file is actually named "cat.jpg" (lowercase c), 
     it won't display on case-sensitive systems like Linux servers -->

<!-- CORRECT: Match the exact file name and capitalisation -->
<img src="cat.jpg" alt="A cat">

Mistake 2: Forgetting the alt attribute.

html

<!-- WRONG: Missing alt attribute -->
<img src="logo.png" width="100" height="50">

<!-- CORRECT: Always include alt text -->
<img src="logo.png" alt="Company logo" width="100" height="50">

Mistake 3: Using a closing tag.

html

<!-- WRONG: img does not need a closing tag -->
<img src="photo.jpg" alt="Photo"></img>

<!-- CORRECT: img is self-closing -->
<img src="photo.jpg" alt="Photo">

✏️ Your Task

Practise what you just learned about HTML Images. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 8 of 11

Part 6 · How to View HTML Source Code

This is a powerful skill that professional web developers use every single day. You can look at the HTML code behind any website in the world.

Method 1 · View Full Page Source

On any web page in your browser:

Windows/Linux: Press Ctrl + U
Mac: Press Cmd + Option + U
Or: Right-click anywhere on the page → select "View Page Source"

A new browser tab opens showing the complete raw HTML code of the entire page.

Why is this useful? You can learn by studying how real websites are built. If you see something on a website you like, you can view the source to see how it was coded.

Method 2 · Inspect a Specific Element

Right-click on any specific element on a web page (a button, an image, a heading) → select "Inspect" (or "Inspect Element").

A panel opens showing:

The HTML of that specific element on the left
The CSS styling applied to it on the right

You can even edit the HTML and CSS live in the browser to experiment · your changes only affect your own browser view and reset when you reload the page.

Try it now: Open any website, right-click on the main heading, and select "Inspect". You will see the <h1> or <h2> tag highlighted. This is exactly what you are learning to write.

✏️ Your Task

Practise what you just learned about How to View HTML Source Code. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 9 of 11

Guided Practice Exercises

🎯 Your Challenge

Now it is time to practice everything you have learned. Work through these exercises in order.

Exercise 1 · Your First Complete HTML Document

Objective: Build a valid HTML document from memory using the correct structure.

Scenario: You are creating the home page for a school project about your favourite subject.

Steps:

Open your text editor (from Lesson 1)
Type the following code exactly:

✏️ Task

Practise what you just learned about Guided Practice Exercises. Open your editor, type the examples above by hand, modify them, and observe what changes.

html

<!DOCTYPE html>
<html>
<body>

<h1>My Favourite Subject: Mathematics</h1>

<h2>Why I Love Maths</h2>
<p>Mathematics helps us understand the patterns in the world around us.</p>
<p>From counting money to building bridges, maths is everywhere.</p>

<h2>My Favourite Topics</h2>
<p>I enjoy algebra, geometry, and statistics the most.</p>

</body>
</html>

Save the file as maths.html
Open it in your browser by double-clicking the file

Expected output:

code

My Favourite Subject: Mathematics    ← large bold heading

Why I Love Maths                     ← medium heading

Mathematics helps us understand the patterns in the world around us.

From counting money to building bridges, maths is everywhere.

My Favourite Topics

I enjoy algebra, geometry, and statistics the most.

Self-check questions:

Does <!DOCTYPE html> appear on the very first line?
Is all your content inside <body>...</body>?
Does every <h2> have a matching </h2>?
Does every <p> have a matching </p>?

Exercise 2 · Adding Links to Your Page

Objective: Add three clickable links to your page.

Scenario: You are adding a "Useful Resources" section to your maths page.

Add the following code just before </body>:

html

<h2>Useful Resources</h2>
<p><a href="https://www.khanacademy.org">Khan Academy</a> - Free maths lessons</p>
<p><a href="https://www.mathisfun.com">Math is Fun</a> - Explanations and games</p>
<p><a href="https://www.wolframalpha.com">Wolfram Alpha</a> - Solve any maths problem</p>

Expected output:

code

Useful Resources

Khan Academy - Free maths lessons
Math is Fun - Explanations and games
Wolfram Alpha - Solve any maths problem

(Each of the three names is a clickable blue link.)

Self-check questions:

Does each link have href="..." with a complete URL including https://?
Is the clickable text between <a> and </a>?
Did you close each <a> tag with </a>?

Exercise 3 · Adding an Image

Objective: Display an image on your page.

Scenario: You want to add a visual to make your page more engaging.

Option A · Use a local image:

Find any image on your computer (e.g., photo.jpg)
Copy it into the same folder as your maths.html file
Add this code after your <h1> heading:

html

<img src="photo.jpg" alt="A descriptive label for the image" width="400" height="250">

Option B · Use an online image:

html

<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Simple_algebra_-_unknown_quantities.svg/320px-Simple_algebra_-_unknown_quantities.svg.png"
     alt="An algebra equation diagram"
     width="320"
     height="240">

Expected output:

code

[Your image appears on the page at 320 × 240 pixels]

Self-check questions:

Does your <img> tag have a src attribute?
Does it have an alt attribute with a meaningful description?
Does it have width and height attributes?
Is there NO closing </img> tag?

Optional what-if challenge: What happens if you remove the width attribute entirely? Try it and observe how the browser behaves.

Exercise 4 · The Complete Profile Page

Objective: Combine everything you have learned into one page.

Scenario: Build a simple "About Me" page that uses all five elements from this lesson: document structure, headings, paragraphs, a link, and an image.

html

<!DOCTYPE html>
<html>
<body>

<h1>About Me</h1>

<img src="https://via.placeholder.com/150" alt="My profile photo" width="150" height="150">

<h2>Who I Am</h2>
<p>My name is [your name]. I am a student learning web development.</p>
<p>I live in [your city] and I am passionate about technology and problem-solving.</p>

<h2>My Hobbies</h2>
<p>I enjoy reading, coding, football, and listening to music.</p>

<h2>My Goal</h2>
<p>I want to build websites and applications that help people in my community.</p>

<h2>Find Me Online</h2>
<p><a href="https://www.linkedin.com">Visit LinkedIn</a> to connect professionally.</p>

</body>
</html>

Expected output:

code

About Me

[Placeholder profile image]

Who I Am

My name is [your name]. I am a student learning web development.
I live in [your city] and I am passionate about technology and problem-solving.

My Hobbies

I enjoy reading, coding, football, and listening to music.

My Goal

I want to build websites and applications that help people in my community.

Find Me Online

Visit LinkedIn     ← clickable link

Phase 10 of 11

HTML Basics Code Challenges

The following challenges test your understanding of basic HTML. Read each challenge carefully, write the code yourself first, then check the solution beneath it.

Challenge 1 · Fix the Broken Document

The following HTML has three errors. Can you find and fix all three?

html

<!DOCTYPE html>
<html>
<body>

<h1>My First Page
<p>Welcome to my website.</p>
<p>This page was made with HTML</p>

</html>

Hints:

One tag is missing its closing tag
One section is missing entirely
One sentence is missing punctuation (though HTML won't care about this one · your reader will!)

Solution:

html

<!DOCTYPE html>
<html>
<body>                            <!-- Error 1 fixed: </body> was missing -->

<h1>My First Page</h1>           <!-- Error 2 fixed: </h1> closing tag was missing -->
<p>Welcome to my website.</p>
<p>This page was made with HTML.</p>   <!-- Error 3 fixed: missing full stop (punctuation) -->

</body>                           <!-- Added missing </body> -->
</html>

Challenge 2 · Build a Product Page

Task: Write the HTML for a simple product page for a phone. It must include:

A <!DOCTYPE html> declaration
A page title using <h1> that says "SmartPhone Pro X"
A <h2> heading saying "Description"
A <p> with a short description of the phone
A <h2> heading saying "Features"
Three separate <p> tags listing three features
An <img> tag with src, alt, width, and height attributes
A link to https://www.gsmarena.com with the text "Read Reviews"

Solution:

html

<!DOCTYPE html>
<html>
<body>

<h1>SmartPhone Pro X</h1>

<img src="phone.jpg" alt="SmartPhone Pro X product photo" width="300" height="400">

<h2>Description</h2>
<p>The SmartPhone Pro X is the latest flagship device with a stunning display and all-day battery life.</p>

<h2>Features</h2>
<p>6.7-inch Super AMOLED display with 120Hz refresh rate.</p>
<p>50MP triple camera system with optical zoom.</p>
<p>5000mAh battery with 65W fast charging.</p>

<p><a href="https://www.gsmarena.com">Read Reviews</a></p>

</body>
</html>

Challenge 3 · Heading Hierarchy

Task: A student wrote the following code. Identify what is wrong with the heading structure and rewrite it correctly.

html

<!-- BROKEN: What is wrong here? -->
<h3>My Blog</h3>
<h1>Latest Post</h1>
<h5>Introduction</h5>
<h2>Main Content</h2>

What is wrong: The headings are completely out of order. <h1> is not the page title but a subsection. <h5> skips straight from <h1> without using <h2>, <h3>, <h4>.

Corrected version:

html

<h1>My Blog</h1>
<h2>Latest Post</h2>
<h3>Introduction</h3>
<h3>Main Content</h3>

Expected output:

code

My Blog                ← biggest (page title)
  Latest Post          ← second biggest (section)
    Introduction       ← smaller (subsection)
    Main Content       ← smaller (subsection)

Challenge 4 · Image and Link Together

Task: Create an image that is also a clickable link. When the user clicks the image, it takes them to https://www.nasa.gov.

Hint: You can nest the <img> tag inside the <a> tag.

Solution:

html

<!DOCTYPE html>
<html>
<body>

<h1>Space Exploration</h1>

<a href="https://www.nasa.gov">
  <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/NASA_logo.svg/200px-NASA_logo.svg.png"
       alt="NASA logo - click to visit NASA website"
       width="200"
       height="200">
</a>

<p>Click the NASA logo above to visit the official NASA website.</p>

</body>
</html>

Expected output:

code

Space Exploration

[NASA logo image — clicking it opens nasa.gov]

Click the NASA logo above to visit the official NASA website.

✏️ Your Task

Practise what you just learned about HTML Basics Code Challenges. Open your editor, type the examples above by hand, modify them, and observe what changes.

Phase 11 of 11

Common Beginner Mistakes · Full Summary

Here is a complete list of all the mistakes beginners commonly make with the concepts in this lesson:

Document Structure Mistakes:

Forgetting <!DOCTYPE html> · always put it on the very first line
Writing content outside of <body>...</body> · all visible content must be inside body
Not closing </html> at the end of the file

Heading Mistakes:

Using multiple <h1> tags · stick to one per page
Skipping heading levels (e.g., going from <h1> directly to <h4>) · always go in order
Using <h1> just to make text big · use CSS for font size, not heading tags

Paragraph Mistakes:

Pressing Enter in code expecting a new paragraph in the browser · use <p> tags
Forgetting closing </p> tags · always close them
Putting blank lines in code expecting blank lines in the browser · use CSS margins

Link Mistakes:

Forgetting https:// in URLs
Not wrapping attribute values in double quotes
Putting the URL as plain text instead of inside href

Image Mistakes:

Wrong file name or wrong case (Cat.jpg vs cat.jpg)
Missing alt attribute
Adding a closing </img> tag · <img> is self-closing
Using a file path that does not match where the image is actually stored

✏️ Your Task

Practise what you just learned about Common Beginner Mistakes · Full Summary. Open your editor, type the examples above by hand, modify them, and observe what changes.

🏗️ Build It — Mini Project

Project Overview

Now you will bring everything together into one complete, polished personal web page.

Project Overview

Project name: My Personal Introduction Page Goal: A complete, valid HTML page about yourself that uses all five core concepts from this lesson.

Stage 1 · Setup (The Document Skeleton)

Create a new file called index.html and write the document structure:

starter.html

<!DOCTYPE html>
<html>
<body>

<!-- Your content will go here in the next stages -->

</body>
</html>

Lesson 02 complete! 🎉

You covered:

✅ Lesson Introduction
✅ Prerequisite Concepts
✅ Part 1 · The HTML Document Structure
✅ Part 2 · HTML Headings
✅ Part 3 · HTML Paragraphs
✅ Part 4 · HTML Links
✅ Part 5 · HTML Images
✅ Part 6 · How to View HTML Source Code

← Lesson 01 Lesson 03 →

HTML Basic Examples: Documents, Headings, Paragraphs, Links & Images

👋 Welcome to Lesson 02

What is an HTML Tag?

What is an HTML Attribute?

What Is an HTML Document?

The <!DOCTYPE html> Declaration

What is it?

Why does it exist?

Rules to remember

Simple example

The Full HTML Document Skeleton

Why is the <body> tag needed?

What are Headings?

Why do headings matter?

Simple Example · All Six Heading Levels

Second Example · Using Headings Like a Real Web Page

Common Beginner Mistake with Headings

What is the <p> Tag?

Simple Example · Two Paragraphs

Second Example · Paragraphs in a Real Context

Common Beginner Mistake with Paragraphs

What is the <a> Tag?

The href Attribute

Simple Example · A Basic Link

Second Example · Multiple Links

Common Beginner Mistakes with Links

What is the <img> Tag?

Why is alt Text So Important?

Simple Example · Displaying a Local Image

Second Example · Image from the Internet

Common Beginner Mistakes with Images

Method 1 · View Full Page Source

Method 2 · Inspect a Specific Element

Exercise 1 · Your First Complete HTML Document

Exercise 2 · Adding Links to Your Page

Exercise 3 · Adding an Image

Exercise 4 · The Complete Profile Page

Challenge 1 · Fix the Broken Document

Challenge 2 · Build a Product Page

Challenge 3 · Heading Hierarchy

Challenge 4 · Image and Link Together

Project Overview

Stage 1 · Setup (The Document Skeleton)

Lesson 02 complete! 🎉

The `<!DOCTYPE html>` Declaration

Why is the `<body>` tag needed?

What is the `<p>` Tag?

What is the `<a>` Tag?

The `href` Attribute

What is the `<img>` Tag?

Why is `alt` Text So Important?