I used Wikipedia quite a lot when researching on the harmonic table format, chord naming and symbols, scales and modes, Roman numeral analysis, and similar stuff. I found myself frequently visiting threads in https://www.reddit.com/r/musictheory/ and https://music.stackexchange.com/.
And of course there are great Youtube channels about music theory (I linked some of them in the Credits page of the website).
Most of the time I just search in Google and jump from blogs to forums to dedicated websites until I find what I'm loooking for.
I used Wikipedia quite a lot when researching on the harmonic table format, chord naming and symbols, scales and modes, Roman numeral analysis, and similar stuff. I found myself frequently visiting threads in https://www.reddit.com/r/musictheory/ and https://music.stackexchange.com/.
And of course there are great Youtube channels about music theory (I linked some of them in the Credits page of the website).
Most of the time I just search in Google and jump from blogs to forums to dedicated websites until I find what I'm loooking for.