I do self-track certain things that are very useful. I keep two logs: 1) concepts log 2) information flow log, and one moderate sized list.
The concepts log records interesting or useful concepts as I encounter then, so I do not have the situation of sitting there wondering where was that discussion of how to do XYZ I'd read six months ago.
The information flow log is a raw stream of ideas and information locations (sites, books, articles)
As a side matter, I keep a list of things I do not know but need to learn. Richard Feynman kept one and it helped him spot holes in his models or domain knowledge.
There's a fourth area where I keep things, and that is a series of 'Library' drives with a large number of directories, one for each area of learning I track, and I copy material into it when I run across it. Thus I can immediately find where I have information on, for example, certain topics in AI, physics, tax law, etc. There is one drive for science, one for technology, one for humanities and more. I use these daily to find things I might have run across years ago.