The Course side panel (Menu) is where you navigate between sections of a course. These include:
Activities - view all of the activities in your course
Students - view all of the students in your course
Teaching team - view all of the teaching team members in your course (instructors, builders & graders)
Gradebook - view your students' grades across all activities at a glance
History - view your course log files (i.e., who did what in your course & when did they do it)