Next.js App Router Basics

What Next.js adds to React

Understand the framework before writing routes.

8 minutes - Absolute beginner

What this means

Next.js is a React framework. React builds UI components, while Next.js adds routing, layouts, server rendering, build tools, and deployment conventions.

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

Beginners often confuse React features with framework features. Knowing the difference helps you read documentation and debug errors.

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

function Page() {
  return <h1>Hello from a page</h1>;
}

Common mistake

Do not assume every Next.js feature exists in plain React. Routing and server components are framework features.

Practice task

List three things React handles and three things Next.js adds around React.

Remember this

Next.js organizes full React applications.

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Examples

Try it: What Next.js adds to React

Edit this focused Next.js example and run it in the browser preview.

Preview runs React in a sandboxed browser frame, never on the server.

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editor

preview

Preparing preview...

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Practice before moving on

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