How to set up Groups and Sections

Learning Environments has produceed a series of comprehensive guides on Groups and Sections.

Groups
Sections

In addition, the Canvas Community Guide also contains several instruction articles on Groups.

How do I add a group set in a subject?
How do I allow students to create their own student groups?
How do I automatically assign students to groups?
How do I manually assign students to groups?
How do I move a student into a different group?
How do I view content and student activity within a group?