In some cases instructions given in one chapter might collide with instructions in a following chapter such as asking for files deleted previously.
CLCC aims to cover the ground needed to start working as fast as possible and avoids advanced functionality and edge-cases.
The book starts out at the very beginning by answering what is a command shell and only then moving forward.
Some of the more technical subjects are only mentioned in passing. The author's are very upfront about not covering the topics in-depth and suggest finding other references for advanced functionality.