How many students take part in a course, on average?

It depends on the time frame you take into account. On average, during the course launch session (which is when you will be the most active and will have the most obligations towards them), it’s comparable to a small classroom workshop. After the course launch session, with the courses being self-paced, the number can go up to several dozen active participants, and hundreds of people auditing (going through the materials but not the labs).