Learndash bbPress Integration
bbPress is a forum plugin for WordPress with overSee above million downloads. This LearnDash bbPress Integration makes it easy for you to add forums to your courses. You can protect the forums so that only users who are enrolled into your courses are able to view content and to post new threads & topics.
Automatic forum access: As soon as someone purchases (or registers) for a course, they are granted forum access so that they can create new threads and topics.