docs.moodle.org/19/en/Forum_moduleLyceum (AKA Moodle) is a widely used Course Managemement System.  Below are links to some useful resources for getting started:

General Guides

Moodle 101 (DePauw University)

Using Moodle (2nd edition)

 docs.moodle.org/19/en/Main_Page

docs.moodle.org/19/en/Forum_module