I’m always on the lookout for materials that help me understand different things that up to now I’ve been otherwise stumped by or had trouble wrapping my mind around. Any subject/topic that’s interested you that whatever you’ve found has helped you gain a greater understanding and appreciation of are welcome!
When I was in middle school, my brother brought me a set of 3 workbooks about Boolean algebra from the high school library. I can’t remember the title or much of anything else about them, but I went through them and did all the exercises, working until I completely understood every lesson. That basic foundation set me up to easily understand programming, SQL queries, and so many other computer-related things. It kinda defined my entire career. That was in 1978 or so, so it’s been awhile! I retired last year, a bit early, after a fairly successful career as a developer and DBA.