Books don’t teach you, neither the teacher. Its your willingness to learn and to do something that makes you learn things. If you’re reading books just for sake of knowledge then it’s better to not to read and do something else; because “knowledge” is useless if you’re not able to apply it i.e. knowledge of wisdom.
So learn things which you’re sure you will use it for yourself and to help others. Knowledge is all about giving, Wisdom is all about accepting as it is and doing things the right way!