🧒 Explain like I'm 5
Think of a component as a vending machine. Props are like the coins you insert from outside — the machine cannot mint its own coins or change the ones you gave it. State is like the internal counter inside the machine that tracks how many items are left — only the machine itself updates that number, and whenever it changes, the machine reacts (re-renders its display).
Interactive quiz
Check your understanding with an instant-feedback quick check.
Detailed notes
Senior-level deep dive: internals, pitfalls, and a self-interview ladder.
Practice with AI feedback
Answer out loud, get scored on correctness, depth, and clarity.