Currently downloading The Witcher 3 for the first time. Got any advice for me?

So I just read this book on history of games called "Blood, Sweat and Pixels" and was fascinated by the chapter on The Witcher 3 and mostly how the team put in so much thought and care in every single side quest. And seems that there are a lot of moral decision to be made on each adventure. So I finally decided to give it a try. Got any advice for me?