Welcome back to “Let’s Master React Hooks Together” — the series where we learn React hooks step by step in the most beginner-friendly way possible. So far in this series, we’ve already explored hooks like useState and useEffect , and by now you’ve probably started noticing one important thing about React: React components re-render a lot. And honestly, that’s completely normal. React is designed that way. But once applications start growing, re-rendering can sometimes create performance problems — especially when expensive calculations run again and again unnecessarily. That’s exactly where today’s hook enters the picture: useMemo () Enter fullscreen mode Exit fullscreen mode At first glance, useMemo looks confusing. Many beginners memorize the syntax without actually understanding: what problem it solves, why it exists, and how it connects with useEffect . So in this 8th episode, we’re going to slow things down and understand useMemo properly from the ground up.…