Common Courses

This block lists any courses you have in common (i.e. you are both enrolled in) with the user whose profile you are viewing.
This is very useful, for example, when a user with a teacher role receives a message from a user with a student role, if that teacher has many courses it is very difficult to know how to contextualize the user who sends a message, if you have this block installed you can limit the context a bit and it will be easier to know what course the student is writing to.