🧒 Explain like I'm 5
Imagine you have a big book with stories from all your friends. Designing a news feed is like figuring out how to quickly find the most interesting stories for you every time you open the book, even if there are millions of stories.
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.
