The short answer is maybe. It will depend on the instructor. Some instructors will have a textbook that accompanies the course, and some will rely solely on web-based resources that they will embed or link to within their course content. Check each of your course syllabi for details.
Textbooks can be online or print-based. If print-based resources are required, you can go to the bookstore for ordering details.
Sometimes instructors will use digital journal articles that are accessed through the library. In these cases, instructors will provide the link to the article, but students will need to sign in with their TWU email to access it.