I'm going through this at the moment. I've come to the point in my life where I've realised I don't understand modern computers, so tasking myself with trying

I'm going through this at the moment. I've come to the point in my life where I've realised I don't understand modern computers, so tasking myself with trying to learn about this stuff. My mental model of computing is stuck at around the Z80, I wrote a gameboy emulator a few years ago, but that's far away from what modern machines are doing!