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The book is a short, but at the same time, fairly complete overview of the key aspects of Angular written by two of its core contributors Victor Savkin and Jeff Cross, founders of Nrwl - Angular Consulting.
To make one thing clear: this book is not a how-to-get-started guide. There is a lot of this kind of information already available online. The goal of this book is different. Read this book after you toyed around with the framework, but before you embark on writing your fist serious Angular application. The book will give you a strong foundation. It will help you put all the concepts in the right places, so you will get a good understanding of why the framework is the way it is.