In Magma Math, each student account belongs to a class, just as most students go to a class in real life. Organizing students in one or more classes makes it easy for you to hand out exercises that suit the whole class.
The reason why we also have the concept of groups is that you should be able to bring together students to whom you often give the same exercises.
For example, it could be a group of students who need to work a little extra with an area or another group of students who need a bigger challenge. With groups, this becomes incredibly smooth.
If you need help getting started with classes or groups, just get in touch in the chat!