WP Courses uses a particular structure which is designed to make it easy to use and navigate for both course creators and students.
The main purpose of a course is to provide a course overview and to contain all of the course content in the form of lessons and quizzes (included with WP Courses Premium).
Courses can also be connected to categories for easy navigation and difficulties.
Teachers are connected to courses mainly as a way for students to see and learn about who is teaching a particular course.
Lessons and quizzes (included with WP Courses Premium) are linked to courses and contain the bulk of your course content.
Modules are for breaking apart lessons into smaller sections.