I was talking to a friend of a friend who is a physics professor, and I asked him what the best way to learn (the basics of) string theory and he said that this book (Superstring Theory Greene, Schwartz Witten) is the best and the one that everyone seems to use. So I went out and brought it after checking some reviews online. Now I am not far into volume 1 and I don't really understand what its talking about. I have only completed advanced high school maths and physics, nothing in college. So I am wondering what I should read up on in order to understand it. Books are the easiest way for me to learn. Thanks. Any recommendations are appreciated.