https://tobyrush.com/theorypages/pdf/en-us/the-whole-enchilada-set.pdf https://tobyrush.com/theorypages/pdf/en-us/the-whole-enchila... This covers most Classic

https://tobyrush.com/theorypages/pdf/en-us/the-whole-enchilada-set.pdf https://tobyrush.com/theorypages/pdf/en-us/the-whole-enchila... This covers most Classical theory in a pretty clear way, it’s cheesy but does a good job. We used this more than the textbook in a music theory class. Jazz and contemporary theory gets a little more fun, but this is a really good place to start.