@Lanny - I had a student pick up that book.
I found it super heavy on the theory and minutia, and light on the practical application. That was my issue.
The theory came at you in fat, chunky, heavy bricks, but didn’t apply to anything.
Josh had recommended another book on here a while back -
https://www.amazon.com/All-About-Music-Theory-Understanding/dp/1423452089
It looked more application friendly, and was a bit easier to get through.
If the Cap book works for you, go for it. Full Speed Ahead! If it seems like it’s denser than it needs to be, or moves fast, or is a bit aggressive with it’s approach and demands… it’s because it is.