JSX basics

What this means

JSX is syntax that looks like HTML but is written inside JavaScript. React uses JSX to describe what should appear on the page.

In beginner terms, this topic answers one practical question: "What should I write, and why does React care about it?" Do not try to memorize the syntax first. First understand the idea, then connect the syntax to that idea.

Why it matters

JSX keeps the markup and the nearby logic close together, so small components are easier to read and change.

When you build real React screens, this idea helps you decide where data should live, what the user should see, and what should happen after an interaction. That is why this lesson is part of the main path instead of being an optional detail.

Step by step

1. Notice the UI problem this topic solves. 2. Look at the smallest possible example. 3. Change one value and predict what should appear. 4. Run the example and compare the result with your prediction. 5. Use the practice task before moving on.

Small example

const message = <p>I am learning JSX.</p>;

Common mistake

JSX is not exactly HTML. Use className instead of class, and close tags like <img />.

Practice task

Write JSX that shows your name inside an h1 and your goal inside a p.

Remember this

JSX is a readable way to describe UI with JavaScript.