I’m now using Anki to learn Vietnamese and to work through Linear Algebra Done Right. It is such a pleasure because I know what I learn won’t evaporate. It’ll be right there, instantly accessible decades from now.
Anki is an incredibly useful tool. I can’t recommend enough.
For knowledges that I’m actively learning, I keep separate decks and have no time limit. Creating, splitting, and tuning cards is fundamental to my learning process.
I mainly study maths and also find Anki useful for learning things like vim shortcuts (Q: Move the cursor to the middle of the screen, A: 'M').
Getting the right level of depth in a maths card is tricky and I don't think I've completely figured it out yet. Too much information in a question or answer and it becomes a 1+ minute problem every time the card appears; but not enough information and it's hard to learn the hard stuff.
So I try and break the problem down into chunks to learn the detail, and also have cards for the higher-level intuition.
I constantly found myself in the following loop:
1) Motivated to study, study productively
2) Several days / weeks later productivity stops (for any number of reasons)
3) Quickly forget everything I learnt over the next month or so
4) Back at stage 1, feeling I have 'wasted' the last few months.
My big problem was the _forgetting_. Life is always going to get in the way, and I needed to 'drop anchor' when this happened, so I could resume where I left off, not start over.
I use Anki [1] to do this. I learn things, make flashcards, and spend dead time on public transport keeping up with them. As Anki uses spaced repetition, you can input a LOT of cards without this becoming overwhelming.
This gave me a sense of progress even when I did not study for a month, and massivly increased my motivation.
[1] https://apps.ankiweb.net/