Adaptive skill practice — find your level, get sharper.
Next.js practice
The App Router, from routing to the Next 16 caching model
Master the Next.js App Router (v16) — Server Components and the "use client" boundary, file-based routing and the special files (layout, page, loading, error), Server Actions for mutations, Route Handlers, the opt-in caching model ("use cache" / Cache Components / Partial Prerendering), streaming with Suspense, the Metadata API, and proxy.ts. Turbopack is the default bundler. Scoped to the App Router and tagged to Next 16 where version-specific. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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