Some other people have complained that this book doesnt go in depth enough and that you should just read this specifications instead. I think that is obviously a very unhelpful idea, seeing as its very hard to know where to start when learning about a topic as complex as this.
I can confidently say that this is the place to start! This book is well written, holds your hand through a lot of the topics without being too dry, and at the end you will know the basics about all aspects of the technology, and you should have a clear path forward from there on how to get deeper understanding on the parts you need. Definitely start with this book, and move on to specs later only if you need to