Learn how to correctly use TypeScript’s never type for impossible states, exhaustive checks, and safer error handling with discriminated unions and Result types.

Learn how to correctly check if a value is an instance of a class in JavaScript using prototype inspection, Symbol.hasInstance, and primitive mapping.

A deep, practical guide to building accessible interfaces using WAI-ARIA roles, states, patterns, and proper keyboard support for modern web applications.

Learn how to fix the "role 'postgres' does not exist" error when deploying a PostgreSQL Docker container, why it happens, and the correct solutions.

Learn how Web Workers, Shared Workers, Service Workers, and Worklets provide real multithreading capabilities in the browser.

Learn how to use Blob objects to handle files, stream large uploads, compress images, export data, and avoid memory leaks in modern front-end apps.

Learn how to create a TypeScript theme switcher using DaisyUI and TanStack Router in a modern Vite project with the new Tailwind plugin syntax.

Learn the key differences between EXISTS and NOT EXISTS in SQL, how they work internally, and when to use each for efficient subquery filtering.

Learn how to configure Webpack step-by-step --- from simple entry/output setups to advanced plugins, loaders, optimizations, and environment-specific builds.

Understand how useCallback, useMemo, and React.memo work together to optimize rendering, reduce re-renders, and improve React app performance.