I'm making up for a terrible math education in Khan Academy and take notes in org-mode using org-roam. Here's an example file, in .md. If you click this link, a download dialog will launch, fair warning http://calebjay.com/examplenotes.md

To answer your question re: search engine. I can't just google, like, every single elementary math concept up through calculus to magically know it. I need the learning/notetaking process to get Chunks of math knowledge in my brain and begin forming neurological patterns between those chunks. This is so I can later apply these chunks during my self-teaching of computer science (another thing I'm very elementary in despite my profession). The notes help me do things like create anki decks and etc as well.

I don't want to know all math, just the very good curriculum that Khan Academy has set out.

Please don't make fun of how elementary my math level is lol. I'm trying.