Who this book is for
People with different backgrounds can take advantage of either the whole book or just parts of it, thanks to the way it is structured. If you have basic object-oriented programming (OOP) knowledge but have never created a game before, or have never created one in Unity, you will find the book to be a nice introduction to game development and Unity's concepts, from the basic to the advanced. You will also find most of this book useful even if you are a seasoned Unity developer who wants to learn how to use its latest features.
On the other hand, if you don't have any programming knowledge, you can also gain from the book, as most chapters don't require programming experience to learn from them. Those chapters will give you a robust basic skillset using which you can start learning how to code in Unity, and by the time you have learned those basics of coding, you can get into the scripting-focused chapters of this book.