I like to use spaced repetition for everything.
I used it so much it has become sort of a "Corgnitive Primitive" where I put everything there: Questions, Facts, Interesting Things, Calendar Events, Prompts, Writing Tips, Mutate-this-idea, Mood Controls, Historical Events and Dates, Todos(Spaced Repetition Productivity?) etc.
One example would be: I've grown from a (...) to a (...). I complete the (...) with something from my current mood. This is good because I'm accumulating "Writings" from myself to publish a novel, manga or story later on. When I need to write something then I just consult my notes for everything I have written at that moment.
I'm currently working on a tool[1] that has built-in Spaced Repetition(I made my own algorithm and don't use SM-2[Anki's Algorithm])