A course is a grouping of lectures that your students will enroll in through your school. Within your school you can have multiple courses and for each course you can choose to charge students a one-time fee, a monthly/annual subscription or even give it away for free.

You can think of courses as a subset of your school's overall theme. For instance, if I were to have a school, "Fun Time Parachuting Academy," I would probably create a course called "An Introduction to Parachuting" along with some other courses like "Advanced Jumping Techniques" and possibly "An Introduction to Base Jumping."