To help review, I made 1,792 flashcards (digital flashcards). This is way too many. I review them on my phone or tablet whenever I get a spare moment (such as during Christmas shopping). Flash cards and spaced repetition go hand-in-hand. Once I get an answer on a flashcard right, I don’t mark it as known. I keep it in the deck and once I’ve seen it and answered it correctly many times, then I mark it as known.