Heads-up: You linked to Beyond LFS, the book for extending an already finished LFS system. The book for installing LFS is https://linuxfromscratch.org/lfs/read.

Heads-up: You linked to Beyond LFS, the book for extending an already finished LFS system. The book for installing LFS is https://linuxfromscratch.org/lfs/read.html https://linuxfromscratch.org/lfs/read.html, which also has a regular and a systemd version.