Study guide · 7 topics
React Exam Study Guide
Seven topic guides covering everything tested on React interviews and front-end exams. Code examples, exam traps, and tips throughout.
Test your React knowledge → Free · No sign-upReact Components & Props Explained — Functional Components & Prop Types
Components and props are the core of React. Here's what interviews test — component design, prop patterns, and composition.
Read guide →02 · 6 min readReact useState Hook — State Management, Updates & Common Patterns
useState is the most-used React hook. Here's what interviews test — state updates, batching, and the patterns that trip people up.
Read guide →03 · 6 min readReact useEffect Explained — Dependencies Array, Cleanup & Pitfalls
useEffect is the most misunderstood React hook. Here's a clear guide to dependencies, cleanup, and the pitfalls that cause bugs.
Read guide →04 · 7 min readReact Hooks Explained — useRef, useMemo, useCallback & useContext
Beyond useState and useEffect, these hooks solve specific problems. Here's what interviews actually test.
Read guide →05 · 5 min readReact Conditional Rendering & Lists — &&, Ternary, and key Prop
Conditional rendering and lists are fundamental React patterns. Here's what interviews test — including the key prop trap.
Read guide →06 · 5 min readReact Forms — Controlled Components, onChange & Form Submission
React forms are fundamental and frequently tested. Here's the controlled vs uncontrolled distinction and everything around form handling.
Read guide →07 · 6 min readReact Component Lifecycle — Mount, Update, Unmount & Re-render Rules
Understanding when and why React renders is critical for performance. Here's what senior interviews cover.
Read guide →Where React leads
Certifications that build on React
Real proctored exams with published blueprints — each with a free readiness test here that scores you per exam domain rather than giving you one number.
GitHub GH-600 (Agentic AI Developer)
Microsoft lists Developer among GH-600’s roles and asks for experience with the SDLC, GitHub workflows and code review. The exam tests running coding agents on a real repository, not a language.