Next.js App Router Master the Next.js App Router for building modern, performant web applications with server components and advanced routing. App Directory Structure The app directory uses file-system based routing with special files: Layouts: Root, Nested, and Templates Dynamic Routes and generateStaticParams Loading UI and Streaming Error Boundaries and Error Handling Route Groups for Organization Parallel Routes Intercepting Routes Metadata API for SEO Route Handlers (API Routes) Middleware When to Use This Skill Use nextjs-app-router when you need to: - Build modern Next.js 13+ applicati…