Top 10 React JS Concepts Every Frontend Developer Must Know
React JS is the most popular frontend library in the world right now — and for good reason. It's fast, flexible, and used by top companies everywhere. If you want a career in frontend development, these are the 10 React concepts you absolutely must know. 1. JSX (JavaScript XML) JSX lets you write HTML-like code inside JavaScript. It makes your components readable and clean. Every React developer writes JSX daily. 2. Functional Components Modern React uses functional components. They're simpler, cleaner, and work perfectly with Hooks. Forget class components for new projects. 3. Props Props pass data from parent to child components. They're read-only and keep your data flow predictable. Understanding props is Day 1 React. 4. State with useState State stores data that changes over time. When state updates, React re-renders the component. This is the heartbeat of every React app. 5. useEffect Hook useEffect runs code after every render — perfect for API calls, even...