Obviously if you could remember everything useful for no effort, that would be ideal. Roughly, Spaced Repetition Studying (SRS) is based around the idea of rec

Obviously if you could remember everything useful for no effort, that would be ideal. Roughly, Spaced Repetition Studying (SRS) is based around the idea of recalling something just before you would otherwise forget it; and that the time it takes to forget something can be increased if you increase these intervals where you practice recalling. Anki is an app which does this. It's super useful for language learning (where you want to recall a vast pool of vocabulary, most of which you won't use frequently). Though, if you're working with something frequently, you won't need to put effort into memorising it.