The best way to get the most about of this book is by knowing what you want NLP to do for you.
A variety of reasons might draw you to NLP. It might be the higher earning potential. Maybe you've noticed and are excited by the potential of NLP, for example, regarding Uber's customer Service bots. Yes, they mostly use bots to answer your complaints instead of humans.
It is useful to know your motivation and write it down. This will help you select problems and projects that excite you. It will also help you be selective when reading this book. This is not an NLP Made Easy or similar book. Let's be honest: this is a challenging topic. Writing down your motivations is a helpful reminder.
As a legal note, the accompanying code has a permissive MIT License. You can use it at your work without legal hassle. That being said, each dependent library is from a third party, and you should definitely check if they allow commercial use or not.
I don't expect you to be able to use all of the tools and techniques mentioned here. Cherry-pick things that make sense.