How to Read a Book

I have started to read a book called How to Read a Book. One of my friends recommended it to me. He said it was one of the best books that he had ever read. It is actually really interesting. I had my doubts with that kind of title.
The book states that there are different levels of reading. The one that we most often do is elementary level reading. As I read the book I realized that this was totally the way that I read most of my books. It goes on to give rules for how to read books in such a way that you get lots out of them. It also teaches how to skim a book. Since it says that lots of books are not worth reading in depth.
A great book highly recommend people to read it.