1.2 …get the most from this book
Firstly, forget DevOps. Seriously, ignore it. Although this book uses the term DevOps (mostly for marketing reasons) it is really more general, it is about how to do IT System Lifecycle Management more effectively. DevOps is a distraction at worst and only a small part of successful IT System Lifecycle Management at best.
Do the examples! You’ll get much more from the material by following along and investigating for yourself.