I'm joining this conversation late. As a professional musician and music teacher, though, I think that a couple of methodological recommendations could help.
Whatever the tools (books, websites, etc) you use, never learn anything that your ear can fully grasp. For instance, in learning Harmony, many apprentices forget to put first their ear on the thing. Instead, they take an exercise as a puzzle or abstract problem, just a matter of only applying the rules. Just don't do this.
The second advise is as important as the first one. Learn basically from the masters. I do really learnt what matters when I see and hear what the best composers are always doing. Books are fine only with the real music in the horizon.
Whatever the tools (books, websites, etc) you use, never learn anything that your ear can fully grasp. For instance, in learning Harmony, many apprentices forget to put first their ear on the thing. Instead, they take an exercise as a puzzle or abstract problem, just a matter of only applying the rules. Just don't do this.
The second advise is as important as the first one. Learn basically from the masters. I do really learnt what matters when I see and hear what the best composers are always doing. Books are fine only with the real music in the horizon.