Do you want to control the student flow through materials in your course? Especially for Open Entry, Open Exit style courses, it can be tricky to help students follow through content in order unless you design your Canvas environment in the right way. Without creating assignment due dates, prerequisites and requirements can help you keep students on track on the modules page.
Prerequisites MUST be used alongside requirements in order to work effectively, so do not skip one or the other!
Canvas Guide: How do I add prerequisites on a module?
Canvas Guide: How do I add requirements to a module?