I'm also always looking for additional low-level understanding. What's tricky is figuring out how to pace it so it's not overwhelming.
Like, my favorite thing is that circuit boards have wobbly traces on them around high-speed interfaces (RAM, PCI, etc) so all the bits in parallel signals arrive at the same time. The clock speeds are specced right up at the edges of the speed electrons can stably flow at.
And this sort of thing is awesome, but like... quite a fair bit beyond the point I'm practically able to engage at.
I guess I'm trying to figure out how to leap without missing anything lol :D which is impossible now I phrase it like that...