Have you ever used flashcards? Sure you did! We’ve all been there and it seems like they are making a comeback. Programmers can remember programming knowledge they don’t use on a day to day basis using spaced repetition.
Sparkle, is a free to use software (web & mobile friendly) that lets you create your flashcards in neatly separated sections. Plus, there are a lot more goodies. Check it out - https://sparkle.apricity.co.in
Sparkle - where you start as a novice and end as a master!