There are often several forums in a Moodle course and these are used for communication between those involved in the course.

Frequently recurring forum is

• News forum
  Here course teachers announces important news and more. Only teachers write here.
• Questions to the course teachers
  Here you can ask questions you have about the course, as long as the question is not of a personal nature. Both questions and answers are seen by everyone involved in the course, and both teachers and students can write and reply to messages.
• Forum: Group
  Here each group has its own, separate "room" for discussion. Can also be seen by the teachers of the course.

When there are posts you have not read in a forum this is signaled on the course main page when you are logged in.