300+ curated questions across 4 tracks. Use the interactive Q&A below for JS / Node / React, or explore the full MDX guide for each track.
Core JS concepts: data types, hoisting, closures, the event loop, scope, ES6+ features, arrays, and more.
Node.js internals, event loop, streams, modules, databases, backend patterns, and scalability.
React hooks, lifecycle, reconciliation, Fiber, state management, Next.js, SSR/SSG, and framework comparisons.
Deep-dive into the Santra CLI project: architecture, TypeScript, AI agents, streaming, error handling, CLI/TUI, testing, and system design.
Organized into 4 tracks — JavaScript, Node.js, React.js, and the Santra CLI project. Click any question to reveal the answer. Mark reviewed to track your progress.