I am looking for words that describe the paragraphs of text and information you find in student textbooks or course books. For example, in a Maths book you can expect sections of written words teaching you concepts and explaining how you should go about solving problems. I want to use 'instructions', but felt that's closely related to hands-on work.
I want it to fill the space in the following sentence I wish to express:
"There isn't a lot of ..... in this textbook, just questions followed by more questions."