Saw your post on your Patreon- if that's what you are working on at the moment, I recommend Berklee Music Theory books 1 and 2. Very straightforward approach that's not cart before the horse like lots of theory approaches. Once you have a good sense of diatonics with the major scale as the origin of everything, you can take that Nobuo piece for example and try to chart the harmonic changes based on the root motion, very easy. It's a good way to work through what he's saying as part of your transcription exercises. :) Good luck, theory is always helpful, it was for me anyway.
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Yeah I understand that, I'm trying to dig each concept slowly and thoroughly now, but the difficulty with those classics is that they often use lots of modulations, modal interchange, chord inversions, Neapolitan chords, nonharmonic tones, weird chord progressions, cadences, etc, which is a pain both to read, interpret and understand what's going on in the music sheet! There's also the problem that too much music theory often leads to analysis paralysis so we often need to practice balancing that which is challenging as well!
Thanks for the reference tho!