The book brings an explanation and purpose of EA, in a very breaf manner, and then focuses on EA principles, what they are and they importance for the construction of an enterprise architecture in a business.
What you will learn is the importance of EA principles, how they make clear for everyone why something must be done and how, allowing to have a common language in the business. They are critical and the core for building an EA.
Don't think it's an easy book to read and understand, starts very well, but some parts of the book are a bit difficult or confusing to understand, but the last parts, especially appendix A, makes suddenly everything clear, and the information there present is of an extreme value (thanks for that 😀 ).
In sum a must read for any business professional that want to know how to bring order to chaos in EA.