Stop that Invitation burden
Your descriptions on course contents are very poor and the information what is provide is completely senseless and worthless. Anyway it seems to be your chosen policy. Still I would like to be able in details and complete what the contents of courses are and all other details about and around the courses. If you want potential learners to first contact the trainer, professor or teacher you still can do that although I disgree because this is meant to be online (free) learning / distant learning.