Required: These materials are essential for the course. You’ll need them to follow lectures, complete assignments, and meet the course objectives.
Recommended: These materials aren’t mandatory, but your instructor strongly suggests them. They offer extra explanations, examples, or practice that can strengthen your understanding of the subject.
Suggested: These items are completely optional. They often complement the required materials and may be commonly purchased with the main textbook or found helpful by past students for deeper learning or added convenience.