That is entirely up to you! Study Groups are for students to collaborate and share with each other as they progress and learn. Find a neat trick or a shortcut to a task? Share it with the group! Not sure on how well you understand a specific lesson? Ask for help! See another student with a question you know the answer to? Help them out!
Instructors are also automatically in every study group related to their course. You can get their attention by using @[instructor name], the same as you would in the community (see here)!