Yeah- but LFS didn't really expose you to that or really teach you much about Systemd internals. Here is the page on it: https://www.linuxfromscratch.org/lfs/view/systemd/chapter09/...

The only other page that covers it is how to compile it and it install it (make configure, make, make install essentially- with a bunch of flags).

It kind of touches upon a few commands that will let you know what its doing and how to get it started, but from this page you don't learn much about how it works.

In fact, one of my takeaways from LFS was that I already kind of knew how a linux system starts... and what I really wanted to learn was how the devices are discovered and configured upon startup to be used, and that is pretty much all done in the black box that is SystemD.