Each Course is a sequence of sessions. When you register onto a course, you will register onto the entire sequence. If the business allows drop-ins for the course, you can register for individual sessions within that course. A course may also have different group options for you to register onto i.e. Group 1 = Monday at 9am-10am for 6 weeks. Group 2 = Wednesday at 9am-10am for 6 weeks, and so on. If the business allows it, you may have the flexibility to move your sessions between groups.