I agree this author seems more interested in self-promotion than anything else. However, I don't think the purpose of this book is to cover these subjects in t

I agree this author seems more interested in self-promotion than anything else. However, I don't think the purpose of this book is to cover these subjects in their entirety. Most of the time, with books like these, I would just like to see definitions, use cases, why it's used, maybe even what it replaced in the space it exists in. Materials like this aren't meant to make you an expert, they are just meant to show you what's out there, why it's out there, and (maybe) what was out there before. They give you context with which to google things. Either way, everyone expects something different from educational materials. I personally would not use this book, but I get the idea he was going for.