Lesson 1 · triangle Next.js & Shipping

The App Router

Map URLs to files and understand the special filenames.

Before you start

Routing is the filesystem. A folder is a URL segment; page.tsx makes it routable. layout.tsx wraps everything below it and persists across navigation — it doesn't re-render when you move between sibling pages, which is why nav state survives.

5 exercises·up to 72 XP·5/5 hearts