Next.js App Router Mastery Core Concepts 1. Server Components by Default - Components are server-rendered unless marked 2. Streaming & Suspense - Progressive rendering with loading states 3. Parallel Routes - Simultaneous route rendering 4. Intercepting Routes - Modal patterns without navigation File Conventions Data Fetching Patterns Server Component Fetching Parallel Data Fetching Streaming with Suspense Server Actions Route Handlers Caching Strategies Metadata Best Practices 1. Keep client components at the leaves of the tree 2. Pass serializable props from server to client components 3. U…