PracticeComing soon
Bite-sized practice
One subject, five minutes a day. It starts with a question, not a lecture, and helps you work the answer out when you cannot.
System Design · today's questionBuilt first. Preview, not interactive yet.
A page loads fast in the morning and slowly at night. Which part do you check first?
- The database
- The cache hit rate
- The load balancer
- I am not sure yet
- Today's question
- One a day. Answer first, read after.
- Quick quizzes
- Three to five questions in about two minutes.
- Quick reads
- One idea on one screen, ending with a check.
- Review queue
- Misses come back a few days later.
A session, start to finish
A question first
Answer before you see anything else.Can't answer? Work it out
Dot asks a smaller question, then gives a hint, then a worked example. You choose how much help you get.A quick read to lock it in
The idea behind the answer, short enough to finish at a bus stop.Back in the review queue
The question returns in a few days. Get it right twice and it moves further out.
Bite-sized practice is being built
Until then, every course chapter ends with a short quiz you can retake.