Graduating from user to power user

I've got a Pop_OS system76 machine that runs well straight out of the box. I love it and it's my daily driver. However I'd like to learn more about how it works, Linux internals and how to use it to the best of its capabilities. I want to learn about things like system-d Wayland, error logging (there seems to be a few of them) directory structure and drivers. For instance, how do I know that my and GPU is being leveraged to the fullest?

I DONT want to build a system from the ground up, which I expect to be a common suggestion.

I'd prefer to read literature, blogs, and articles relevant to me, my system and not dated.

Any suggestions? Thanks in advance