🧒 Explain like I'm 5
Imagine you want to watch a video, and while you start watching an older version, a new version is being downloaded in the background. This way, you don't have to wait to start watching, and soon you'll have the latest version too.
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.
