This is an excellent book that explores the various Dzogchen meditation practices. In this book the author introduces readers to practices of the body, speech and mind. Each of the practices is walked through and explained so that the reader can try them. I recommend doing the exercises regularly. After you've done them for a bit, you'll start to notice how your mental and physical state of being changes. The author does cover some of these practices in is other books, but what I like about this book is that he presents a different perspective that helps you deepen your understanding of those practices, complementing what he's shared in the other works. If you want to do internal work, this book is a great place to start or continue your journey.