I've begun building an LFS system because I've heard it's a great way to learn Linux. I'm in the middle of chapter 5 right now (and you can see the TOC here), and all I've done so far is set up my host environment, download a bunch of packages, and I have begun compiling them. I'm not sure what I'm supposed to be learning from issuing a bunch of configure/make commands.
Could anyone please give me some advice on how to get the most out of building an LFS system? What and where in particular should I be focusing my attention?