Any good introductory guide for learning the very basics of music theory? I have no real practical need for it but have always been really curious about it. This cheatsheet is very cool but a lot of the terminology is beyond me.
Language Transfer have a course on music theory that I've been quite enjoying, for the low, low price of free (although if you like it, consider giving a donation): https://www.languagetransfer.org/music
Not free, but these books from "hook theory" are great and their tools are also amazing. Complementary to the tools at muted.io that the OP references...