It depends on the course.
For example, some courses may have textbooks involved, but more and more teachers do get away from textbooks, depending on their course. One, the information is changing so rapidly, and two, book budgets in school boards have declined very much so because we have access to other information--the Internet, of course, being one of them, and all kinds of different access to information. Fewer courses will have textbooks associated with them because of that rapid change in education, in knowledge.