Here is an additional resource:
https://hamstudy.org/.
I found it a bit more direct to study the questions and answers directly. I'm not an electronics guy. I found the depth of material in the study guides to be more than I was really interested in knowing. As Badger said, you really do the learning you need once you get your license and start figuring out how to use your equipment to do what you want to.
If I can do it, anybody can. Please feel free to reach out if there is anything I can do to help out or any questions I can answer.
Good luck!