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Fixes for the form, Server Action and upload problems Next.js 16 developers hit most, from a submit button that never shows pending to "Failed to find Server Action" after a deploy, each traced to the line that causes it.
Fixes for the performance, configuration and deployment problems Next.js 16 developers hit most, from oversized client bundles and frozen NEXT_PUBLIC_ values to stale caches across pods and "Failed to find Server Action" after a deploy.
Fourteen recipes for the rendering errors Next.js 16 developers hit most, from serialization and "use client" mistakes to hydration mismatches, theme flash and prerender bailouts, each traced to the line that throws it.
Thirteen fixes for the routing problems Next.js 16 developers hit most, from route modals and missing default.js files to active links, URL state, scroll, i18n, protected sections and basePath.
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.