What materials should I save once a course is completed?

You should keep the grade lists, should a student challenge a mark. NEED MORE DATA HERE

It is also worthwhile to save your reading list, course description, syllabus, lecture notes, and handouts. These materials will come in handy when you are planning to teach the course again, and can be valuable when you come up for reappointment, merit increase, mid-career appraisal, or promotion to tenure. During each of these review processes, you will be asked to present evidence of your abilities and accomplishments as an instructor.