Thanks, I do find microarchitecture stuff really interesting but it's a bit out of my depth if i'm honest.

I find CPUs fascinating to be honest. While they are complex, they are not impenetrable. Playing with small assembly snippets and simulators helped me a lot to understand them.

Also, other architectures such as MIPS and M68K have simpler to understand ISAs which accelerate the process of understanding these small wonders.