Anki might be worth your while if you are trying to learn something.
Load it up with a flashcard deck of something you want to remember, and it’ll show you those flashcards. Lots of people use it to learn languages, but it’s also good for anything that requires memorisation.
Worth noting that particular subreddit appears to be pretty heavily astroturfed. To the point where some detransitioners created r/actualdetrans to get away from the TERFs.