I used Anki pretty heavily during ~8 years of law school and it was a game-changer. Two things that helped me the most (and that I think apply to any kind of flashcards, digital or paper):

- The twenty rules of formulating knowledge (https://www.supermemo.com/en/blog/twenty-rules-of-formulatin...) ; old but really solid advice on how to actually write cards that stick.

- The book Fluent Forever; it’s meant for languages, but the general principles carry over to learning basically anything.