It is always much more convenient to learn something if you have some manual or guidelines. For example, you will hardly get along with a new technological device if you have no manual to it. That is just for studying as well. If you start learning some new discipline, it is more than desirable that you should have written syllabus and some guideline materials with useful and helpful information. Students desperately need recommendations on various themes and of various directions, because educational path is easier gone through if guided by wise teachers.