Virtually everything is worth entering into cards. Anki's interface is very tedious, but it's nearly always worth it.
Looking back at source material is not a form of spaced repetition. By learning that you don't need to remember it, it's actually harmful for memorization. Trying to remember things without looking them up (really making an effort) is better and can be almost as good if you fit between the spaced repetition intervals, but you might as well systemitize it.
Looking back at source material is not a form of spaced repetition. By learning that you don't need to remember it, it's actually harmful for memorization. Trying to remember things without looking them up (really making an effort) is better and can be almost as good if you fit between the spaced repetition intervals, but you might as well systemitize it.