If you have never done any type of construction, buy this book. Even if you have only visited a construction site once in your life this book is below your expectations. The majority of the book is showing that taking two pieces of wood nailed at 90 degrees with a triangle placed perpendicular to the joint in different jobs. I thought I would learn something new but I was wrong. I would have returned it but it would cost just as much to ship it back as it cost in the first place.