I read the 8th Edition of this book. It is often mentioned in the same breath as the "Unix and Linux System Administration Handbook", but I think they're quite different.
This book is a sequence of tutorials from beginner to advanced in that order. It's a guide to using the operating system effectively. The "Unix and Linux System Administration Handbook" is, like the title states, a handbook. It organizes by topic and presents in very dry and sparse way.
If you want to learn how to use Linux, I recommend this book. If you need a heavy-duty reference for work or serious amateur computing, get "Unix and Linux System Administration Handbook". (I have both! Of Course.)
I should note that I didn't read every chapter of this book, because some of the sections were especially particular, like running a Samba Server, or using SE Linux to enhance Linux's already expansive security toolkit.
I encourage readers to read as they're interested, but also keep in mind that some chapters are pretty essential to understanding Linux, and you'll get a sense of what they are if you just start from the beginning.
I also encourage readers to read the intro about the incredible history of the completely free and open source operating system, Linux.
Moreover, the last chapter before the appendices is called "Securing Linux on a Network". In the last paragraph, the authors say "goodbye". I read this book on and off for about a year, just after finishing school and just before getting a job in IT. It was a long journey with talented and caring instructors. This last paragraph kind of choked me up. Definitely check that paragraph out when you're ready to quit, even if you don't read the whole chapter.
Final note: it might help to check out some Youtube tutorials before approaching this book. There are in fact many courses on sites like Udemy that can give you a quicker start. I nonetheless think that this book is filled with the gems of the most genuine experts. The specificity and appropriateness of each section, scripted shortcuts, diagrams, and other means of conceptualization, have no replacement in a standard video course.
If you're serious about Linux, definitely read. But if you just need the basics, a few videos might get you farther quicker.
I feel very fortunate to have encountered and read this book.