First, it's said that "Book is the best friend of people". Indeed, i'm totally convinced by this statement. We all need books to broaden our mind to the widely horizon. In fact, based on the pratical lessons, books record a large amount of knowledge which provides people the useful things in practical activities. For instance, you want to study computer, it's surely easier for you if we consult the computing books in advance. Therefore, the ability of success is probably higher when we apply knowledge in books into reality. Generally, if you have no experience in certain fields, I think you'd better follow the books.