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Day 7 of 28 Β· Vibe Coding Challenge

Reading and Understanding AI Code

You don't need to write code to vibe code. But you should be able to read it β€” at least a little bit. Not to become a programmer, but to understand what the AI built, spot obvious problems, and make smarter requests.

Today you'll learn to read AI-generated code without fear.

You already read code β€” you just don't know it

HTML reads like English. Look at this:

```

<h1>Welcome to My Site</h1>

<p>This is a paragraph about my work.</p>

<button>Contact Me</button>

```

You already know what that does. A heading, a paragraph, a button. Code isn't a foreign language β€” it's structured English with extra punctuation.

CSS reads like instructions:

```

color: blue;

font-size: 24px;

background: #1a1a2e;

```

Color is blue. Font size is 24 pixels. Background is a dark color. You can read this.

Knowledge Check
What does `font-size: 24px` do?
A
Creates 24 paragraphs
B
Sets the text size to 24 pixels
C
Moves the text 24 pixels to the right
D
Sets the font color to 24 pixels
CSS properties are descriptive. font-size sets the size of the text. color sets the color. background sets the background. margin creates space around an element. Most CSS reads exactly like what it does.

The file structure

When AI builds a project, it creates files organized in a predictable way:

index.html (or page.tsx, index.js) β€” the main page. This is what people see first.

styles.css (or globals.css) β€” the design rules. Colors, fonts, spacing, layout.

components/ β€” reusable pieces. A navbar, a button, a card. Each component is its own file.

public/ β€” static files like images, icons, and fonts.

package.json β€” the project's "recipe card." Lists what tools and libraries the project uses.

You don't need to understand every file. Just knowing which file does what lets you tell the AI where to make changes.

πŸ€–
Cursor AI
online
The hero section text is too small. Where do I change that?
The hero section text is styled in `styles/hero.css` on line 12: `font-size: 2rem;` I can bump it up to `3.5rem` for you. Want me to make that change?
Yes, do it.
Done βœ“ Font size updated to 3.5rem. Refresh to see the change.
↻ Replay conversation
Knowledge Check
If you want to change how something looks (color, size, spacing), which type of file would you check?
A
The package.json
B
The README
C
The CSS or styles file
D
The HTML file
CSS (Cascading Style Sheets) controls the visual presentation β€” colors, sizes, spacing, fonts, layout. HTML defines the structure and content. If something looks wrong, the fix is almost always in a CSS file.

Reading code like a detective

You don't need to understand every line. Use these strategies:

Read the file names. `PricingTable.tsx` probably contains the pricing table. `useAuth.ts` probably handles authentication. Good code names things clearly.

Read the comments. AI-generated code often includes comments explaining what each section does. Look for lines starting with `//` or `/ /`.

Look for familiar words. Even inside complex code, you'll see words like `button`, `title`, `email`, `price`, `user`. These tell you what that section is about.

Search for text you can see. If the page says "Get Started Free" and you want to change it, search the code for that exact phrase. You'll find exactly where to change it.

πŸ€–
Cursor AI
online
I see "Start Your Free Trial" on the page but I want it to say "Get Started Now." How do I find it in the code?
I searched the codebase and found it in `components/Hero.tsx` on line 23: `<button>Start Your Free Trial</button>` Want me to change it to "Get Started Now"?
Yes please.
Done βœ“ Updated the button text to "Get Started Now."
↻ Replay conversation
Knowledge Check
What's the fastest way to find where a specific piece of text lives in the code?
A
Search the codebase for the exact text you see on the page
B
Ask a programmer to find it
C
Read every file from top to bottom
D
Guess which file it might be in
All code editors have a search function (usually Cmd+Shift+F or Ctrl+Shift+F). Search for the exact text β€” "Start Your Free Trial" β€” and you'll jump straight to the line that renders it. No guessing required.

When to read code vs. when to just ask

Here's a practical rule:

Just ask the AI when you want to change something and don't care how it works. "Move the pricing section above the testimonials." Done.

Read the code when something isn't working and you need to understand why. Or when the AI keeps misunderstanding your request and you want to point it to the exact file and line.

Copy and paste code into the AI when you want to explain what you're seeing. "This code is supposed to show a modal when I click the button, but nothing happens. Here's the component: [paste code]."

Most of the time, you'll just ask. But the ability to read code is your safety net β€” it keeps you in control.

Knowledge Check
When should you try reading the code yourself instead of just asking the AI?
A
Only when the AI tells you to
B
Always β€” you should read every line
C
Never β€” always let the AI handle everything
D
When something isn't working and you need to understand why, or when the AI keeps misunderstanding your request
Reading code is your debugging superpower. When things break or when the AI isn't getting your request right, looking at the actual code helps you give more precise instructions. You don't need to understand every line β€” just enough to point the AI in the right direction.

Week 1 recap

Look at what you've covered in just seven days:

Day 1 β€” You learned what vibe coding is and why it matters

Day 2 β€” You explored the AI coding toolkit β€” editors and app builders

Day 3 β€” You understood how AI generates code and why context matters

Day 4 β€” You set up your environment β€” Cursor and Bolt ready to go

Day 5 β€” You built your first real project from a prompt

Day 6 β€” You learned the SPEC framework for writing effective prompts

Day 7 β€” You learned to read AI-generated code without fear

You're not a passive consumer anymore. You know how the tools work, how to communicate with them, and how to understand what they build. Starting tomorrow, you'll use all of this to build increasingly ambitious projects.

Final Check
What's the most important skill you developed this week?
A
Writing code from scratch
B
Communicating clearly with AI tools and understanding what they produce
C
Memorizing programming syntax
D
Installing complex developer tools
Vibe coding is a communication skill. You learned to describe what you want (SPEC framework), understand what the AI builds (reading code), and iterate until it's right. Those fundamentals carry you through everything that comes next.
πŸ“–
Day 7 Complete β€” Week 1 Done!
"You can't write code yet, but you can read it. That makes you dangerous in the best way."
Tomorrow β€” Day 8
Building a Landing Page
Week 2 begins! You'll build a professional landing page from scratch β€” the kind businesses pay thousands for.
πŸ”₯1
1 day streak!