The trouble is, that's a little like saying Linux is open source so if you want to learn how a real world operating system is implemented you can just go and re

The trouble is, that's a little like saying Linux is open source so if you want to learn how a real world operating system is implemented you can just go and read the kernel code. While technically true, without any sort of guide to which parts are important and what the big picture looks like, it's difficult for a beginner to know where to start.