A digital garden by Sina Salahshour
Notes, deep dives and explainers, published straight from my Obsidian vault. Diagrams, footnotes and the occasional rabbit hole.
Courses
Series
A plain-language course on the ideas behind React 19, from UI as a function of state through rendering, reconciliation, fiber, priorities, commit and hooks, built on one small app.
Series
A source-level tour of how React 19 turns your components into pixels, from createRoot and lanes to fibers, hooks, the commit phase and the React Compiler.
Series
A practical, source-backed course on Next.js 16, from the App Router, Server Components and Cache Components to rendering strategies, auth patterns and recipes for everyday problems.
Latest
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.
How to choose between SSG, ISR, SSR, PPR, CSR and a full SPA in Next.js 16, and how the build decides on its own whether a route is static, partial or dynamic.
How Partial Prerendering works in Next.js 16 with Cache Components, from detecting dynamic access in the prerender to the postponed state and the resume render, and how to design pages for it.
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