Capstone projects are broken up into a series of milestones. Some milestones have a grading of Team, which means the whole team receives one grade. Others have Individual grading, which means each person gets an individual grade.
The feedback will mostly be in the form of new GitHub Issues, associated with the milestone, in your github project.
Note that M4,M5,M6 have deadlines that are before M3. You need to start work on M3 early as it will take you several weeks.