HTML and CSS are still essential: they describe and style web interfaces. React adds a way to build those interfaces from JavaScript components and update what appears on screen when data changes. You do not need React for every page—a static site may work perfectly well without it—but it can help when an interface has reusable pieces or changing content.
The bridge from HTML and CSS to React is JavaScript. Learn enough JavaScript to work with functions, arrays, objects, and modules, then practice JSX, components, props, events, and state in that order.
What changes when you move from HTML and CSS to React?
With a straightforward static page, you write HTML for the structure and CSS for its appearance. React lets you describe interface pieces as components—JavaScript functions that return markup—and compose those pieces into a page. When the data or state used by a component changes, React can render the updated interface.
React does not replace HTML concepts or CSS. You still use familiar elements and styling; for example, React supports CSS classes through the className attribute. It is a library for building user interfaces, not a requirement for every website. If a page is static and simple, plain HTML and CSS may be the more direct choice. React’s learning materials introduce components and interactive UI, while its guidance on adding React to an existing project describes incremental adoption.
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Which JavaScript should you know first?
Before starting React, be comfortable reading and writing JavaScript that can describe data and behavior. You do not need to master every JavaScript feature first, but a shaky grasp of the basics makes JSX and component examples harder to follow.
- Functions, including returning a value from a function.
- Arrays and objects, and accessing their values.
- JavaScript modules: importing and exporting code between files.
- Basic browser developer tools and, if you plan to run a local project, using a terminal or command line.
MDN’s React introduction lists familiarity with HTML, CSS, JavaScript, and the terminal or command line among its prerequisites: MDN: Getting started with React. If functions, arrays, objects, or modules are unfamiliar, strengthen those foundations before trying to learn React APIs.
How to transition from HTML to React step by step
1. Choose a small page or use the browser sandbox
Start with a page you understand, such as a header with a few cards or a short list. React’s documentation includes an in-browser sandbox, so you can experiment without setting up a local project first. If you already have a site and want to add React to only one area, React also supports adding it to an existing project.
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2. Identify components in the page
Look for meaningful pieces that can stand alone or repeat: a header, a card, a list item, or a button. A component is commonly a JavaScript function that returns JSX. You can use smaller components inside larger ones to assemble the page.
function Greeting() {
return <h1>Hello</h1>;
}
function App() {
return (
<main>
<Greeting />
<p>Welcome to my page.</p>
</main>
);
}In this example, Greeting is a component used inside App. Component names begin with a capital letter, which helps distinguish them from built-in, lowercase HTML elements.
3. Learn JSX’s practical rules
JSX resembles HTML, but it is JavaScript syntax, so a few details differ. Close tags, use className rather than HTML’s class, and wrap multiple sibling elements in a shared parent or a fragment. Use curly braces to put a JavaScript value or expression into the markup.
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function Welcome({ name }) {
return (
<section className="welcome">
<h1>Hello, {name}</h1>
</section>
);
}Here, {name} inserts a JavaScript value into the JSX. Keep using CSS files if that suits your workflow; React does not require one particular styling approach.
4. Pass data with props
Props are inputs a parent component passes to a child component. They let you reuse a component with different content instead of duplicating its markup.
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return <li>{label}</li>;
}
function List() {
return (
<ul>
<Item label="Learn JSX" />
<Item label="Build a component" />
</ul>
);
}In this example, each Item receives a different label. The component displays the data; the parent supplies it.
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5. Add an event, then state
An event handler lets a component respond to an action, such as a button click. When the interaction should change what the interface displays, use state for the changing value. Avoid introducing state for information that never changes or for values that can be derived from other data.
import { useState } from 'react';
function ToggleDetails() {
const [showDetails, setShowDetails] = useState(false);
return (
<section>
<button onClick={() => setShowDetails(!showDetails)}>
Toggle details
</button>
{showDetails && <p>More information appears here.</p>}
</section>
);
}The button’s click handler updates state, and the JSX uses that state to decide whether to render the paragraph. React’s Quick Start covers events, state, and sharing data between components: React Quick Start.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should your first React project be?
Build a small filterable list or to-do interface. It gives you a manageable way to practice components, props, events, and state together without needing a large application.
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- Write a short set of sample items as JavaScript data.
- Make a component for one item and pass each item’s content to it with props.
- Compose those item components into a list.
- Add a button, checkbox, or text field with an event handler.
- Use state only for the value that changes the rendered interface—for example, the current filter or whether an item is complete.
Keep the first version narrow. The aim is to understand how data flows into components and how an interaction changes what is rendered, rather than to add every React feature at once. React’s official learning path is a useful companion as you add those concepts.
Which setup should you choose?
The right starting point depends on whether you are experimenting, extending an existing site, or beginning a new app. React’s current installation guidance recommends a framework for new apps, while also offering a from-scratch path for learning or projects with specific constraints. It lists Next.js and React Router for web apps, and Expo for universal Android, iOS, and web apps with native UIs. See React: Creating a React app and React: Add React to an existing project.
| Starting point | Best fit | Trade-off |
|---|---|---|
| Official in-browser sandbox | Trying React concepts without local setup. | Convenient for learning; it is not, by itself, a complete app setup. |
| Add React to an existing site | Introducing React into one part of a site you already have. | You work within the existing project’s setup and conventions. |
| Build from scratch | Learning the fundamentals or working under constraints that call for choosing the pieces yourself. | You must make independent choices for common needs such as routing and data fetching. |
| Use a framework | Starting a new app intended to grow and deploy. | You adopt the framework’s conventions and included patterns. |
Do not start a new project with an old tutorial’s Create React App instructions: React’s official installation page marks Create React App as deprecated. For a new app, follow the current recommendation and setup instructions in the React documentation rather than assuming an older tutorial’s commands remain current. React documentation.
When HTML and CSS are enough
React is useful when component composition and updates driven by data suit the problem. It is not a prerequisite for building a web page. For a simple page whose content does not need an interactive application interface, HTML and CSS may be all you need; JavaScript can also be added without adopting React. Learn React when you have a concrete interface to build and are ready to use JavaScript to organize and update it.
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