🧒 Explain like I'm 5
Imagine you have a special number for each message that tells you exactly when it was sent and makes sure no two messages have the same number. This helps keep everything in order and makes it easy to find messages.
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.
