There is nothing particularly new in this book. It just discusses how to write "clean code" -- the code that is really easy to understand and maintain. Nevertheless this book is worth reading just to remind you another time how important "clean code" is!
This book provides lots of concrete advice how to make your code "cleaner". It discusses importance of proper naming, code formatting and testing. It stresses importance of constant refactoring and provides several extended refactoring examples. But the most important advice the book gives is to always commit better code then you have checked out.
Some advices given in the book can be disputed. Some chapters are weaker (in particular chapters on concurrent programming are quite superficial). Still overall book is definitely worth time spent reading it.
2017: The Year of Golang
4 months ago