Course participant's forum (ask questions from a teacher/other participants)

Course participant's forum (ask questions from a teacher/other participants). Each new question should be created as a new discussion topic. If question is raised from/about some specific page/image/equation etc., do give a page number for a reference. 

Discussion topic title should include a general term in short but informative way so that it can be easily find by other participants and therefore the number of same questions is reduced and forum itself has a cleaner look.