Marty, if you like reading older books there are a couple available as free downloads from archive .org. If you are more visual you may not like them.
“Composition” by Arthur Wesley Dow , has exercises and discussions on line, Notan, and colour and more.
“Pictorial Composition” by Henry Rankin Poore, this is a bit more theoretical and possibly outdated thinking, but may be of interest if you like to read stuff like this.
Hope the links work. If you look around that site you might find better scan copies. Both of these used to be available as print copies from Dover if you prefer paper books, although the Poore book is a bit different to the original.
At least these are a good price if you want to check them out.