Use the Manage Sections tool to divide your class into sections and help manage large enrollments. Sections make it easier to organize assistants, assignments, and grades.
When sections exist for a course, users only see learning materials and users from their own section. If you want users to see all users and content for a course, but be a part of a group for a specific project or activity, use the Groups tool.
What are the basics of Sections?
How do I create and manage sections?
How do I manage section enrollments?