If you know React Router, grasping routing in Next.js will be straightforward for you.

What is Routing anyways?

Routing in NextJs refers to how the framework maps URLs to specific components in your application. It allows users to navigate between different sections of your app and keeps the URL in sync with the content being displayed.

How does it work?

Let's get started.

Let's create a Next.js project.
npx create-next-app@latest

We'll choose the default options.

Let's now execute the app with npm run dev

Fast forward to creating a routes.
After clearing the css make a folder inside src/app name it anything you want. I'll make Hello for this example.
After creating folder, inside make a new file with name page.tsx or page.jsx

Let's create something inside Hello/page.tsx

export default function Hello() {
  return (
    <div className="h-screen flex justify-center items-center">
      <span className="text-4xl">Hello World Page</span>
    </div>
  );
}

and after that lets modify the page for src/page.tsx

export default function Home() {
  return (
    <div className="h-screen flex flex-col justify-center items-center">
      <span className="text-4xl">Home Page</span>
      <button className="p-2 bg-teal-200 mt-2 rounded-xl">
        Redirect to /Hello
      </button>
    </div>
  );
}

We have already created our Router when we made our Hello/page.tsx page. You can view it by entering /Hello in the URL bar, like this: http://localhost:3000/Hello. This will take you to the Hello/page.tsx page or component.

Now for the final touchups we'll make a button that redirects to the component.

Home/page.tsx

import Link from "next/link";

export default function Hello() {
  return (
    <div className="h-screen flex flex-col justify-center items-center">
      <span className="text-4xl">Hello World Page</span>
      <button className="p-2 bg-teal-200 mt-2 rounded-xl">
        <Link href="/">Redirect to /Home</Link>
      </button>
    </div>
  );
}

app/page.tsx

import Link from "next/link";

export default function Home() {
  return (
    <div className="h-screen flex flex-col justify-center items-center">
      <span className="text-4xl">Home Page</span>
      <button className="p-2 bg-teal-200 mt-2 rounded-xl">
        <Link href="/Hello">Redirect to /Hello</Link>
      </button>
    </div>
  );
}

Here's the final output.

And that's it.
Now go and build your own webapps with Nextjs.
Happy Learning. :)