I have bought several books on Linux, especially on the core of the operating system itself.
Wait a minute! All of them have very good work. All have very good forewords, contents, and almost all of them have the same chapter content and especially in the same order.
Look at me! I studied Electronics Engineering. My experience is about the two magnificent worlds of computer and telecommunications. Even for me, at the time of this writing I am 44, it is very hard...