I've been a professional software developer for just over twenty years now, and in that time I've been involved in a number of projects ranging from simple single-user desktop utilities to high-concurrency/high-availability enterprise solutions used by some of the nation's largest equipment manufacturers, and most recently independent game development. I've worked with a large variety of tools, programming languages, development environments, and target platforms.One of the important lessons I've learned during all of this is that the right book can help immeasurably in getting up to speed quickly when working with something new. In my opinion, Unity Multiplayer Games is one such book.It's not an exhaustive reference, but it does cover everything you need to get started with multiplayer networking quickly. It covers not only Unity's built-in networking infrastructure, but also the most popular third-party libraries (all of which are free or have free or trial versions). There's some overlap in some of the third-party libraries that are covered, but the book also includes coverage of non-overlapping and complementary libraries for requirements such as storing game data remotely.If you are looking for a good treatment on multiplayer networking for Unity, I highly recommend this book.