If you're not aiming to build a complete system for every day use, the book still teaches how to bootstrap Linux. So if you know how to build and install regul

If you're not aiming to build a complete system for every day use, the book still teaches how to bootstrap Linux. So if you know how to build and install regular software, you might still be interested in cross-compiling and creating a tiny Linux kernel and rootfs you can boot in an emulator like qemu. You can either use glibc and GNU userspace or use ucLibc and busybox, or perhaps glibc+busybox. If you already know how to bootstrap a Linux system, then you can go through the book and build a few dozen packages by hand and sooner or later you will learn to appreciate the efforts of Debian (and other) package maintainers go through.