I keep offline notebooks where I basically take notes of hopefully most things, that I read or think about. Ideas for programs, proofs of theorems, lecture note

I keep offline notebooks where I basically take notes of hopefully most things, that I read or think about. Ideas for programs, proofs of theorems, lecture notes and so on. I also start small git repos with projects, e.g. for a set of algorithms I explore. Haven't found a good system though, a hierarchy or learn graph or mind map (mind map programs kind of bore me). My hope is that most of what I write down will compile (so to speak) into my brain, at least a little bit. And that the mind map will emerge actually in my mind as I move along. This system is not perfect, but I haven't started to optimize it (maybe I should). One next step that I think about is to product short texts in a top-down fashion. That is, start with some high-level idea to express or illustrate. Then descend into special concepts and so on. Writing is to thinking, what walking is to a map.