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This provides a pretty good intro to GPOs if you haven't got your hands to dirty with them before. A couple of times you need to read between the lines a little bit to iron out a couple of minor issues in following the labs. But that's no bad thing really as that helps you to start thinking more about what you are doing, rather than just following it through noddy style.
Jordan Krause is my favorite technical author, as he writes extremely well, with a great sense of humor. Although a 30+ year veteran in IT, I come away from his books with valuable insights and knowledge, plus it is nice to get affirmation of some things I've been doing correctly all along. I would also highly recommend his book on Server 2019 if that is in your future.