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A complete, copy-pasteable TanStack Query v5 setup for the Next.js 16.4.3 App Router - per-request clients, server prefetch with streamed pending queries, HydrationBoundary, useSuspenseQuery, mutations that invalidate both caches, Cache Components, and the pitfalls.
How Next.js 16 turns thrown errors into UI and status codes (error.tsx, catchError, notFound, forbidden, unauthorized, redirect) and how the request lifecycle APIs after, connection, cookies, headers, draftMode and instrumentation.ts work under the hood.
How the App Router turns folders and special files into a loader tree, how that tree becomes nested layouts, boundaries and slots, and what dynamic, grouped, parallel and intercepted segments really do in Next.js 16.4.3.
A complete cookie-session auth build for Next.js 16, covering encrypted sessions with jose, login and logout Server Actions, an optimistic check in proxy.ts, a Data Access Layer with verifySession, authorization in actions and Route Handlers, unauthorized() and forbidden(), and the rules for auth under Cache Components.
How route.ts handlers are dispatched and when a GET is prerendered, and how proxy.ts (the renamed middleware) runs before routing, matches paths and talks to the router through response headers.
Fixes for the data and caching problems Next.js 16 developers hit most, from stale data after a mutation to the blocking-route error, each traced to the source line that causes it.