Getting Started with Next.js 15

The App Router changes how you build pages. Server Components render on the server, while Client Components handle interactivity.

Key ideas

• Server Components are the default.
• Add the use client directive only when you need state or effects.
• params and searchParams are now promises.

What to try first

Build a small page with generateMetadata, then add a client component for a counter.

Start simple, add interactivity only where it is needed.