One example I had in mind when I said I was forgetting algorithms and data structures was about Skip List - https://en.wikipedia.org/wiki/Skip_list

I did an implementation of a skip list a long time ago (and I found the algorithms to insert, search, etc. quite simple and elegant). Recently I had a chat with someone and I was struggling to explain them.

I could design a few cards for skip lists:

- Question "ELI5 skip list" Answer "the actual ELI5"

- Question "What sort of problems are solved by skip lists?"

- Question "How to make a skip list indexable"

- Question "How to insert the element 123 in a 3 levels skip lists [1, 4 - 4 - 4, 43, 120, 210 - 210, 302]" <- make a better ASCII scheme. etc...

Answers can be quite long. For the french motorcycle license, some answers can be very long (2 or 3 pages) and it works pretty well for me (see https://ankiweb.net/shared/info/1156061502).

When you train: after reading the question try to recall the answer in your head and then read the answer. Then you evaluate how good you were recalling and you pick the Anki "score" (bad, hard, good, too easy).