Start your assignment
You can start working on your copy of Exercise 3 by accepting the GitHub Classroom assignment.
You can also take a look at the open course copy of Exercise 3 in the course GitHub repository (does not require logging in). Note that you should not try to make changes to this copy of the exercise, but rather only to the copy available via GitHub Classroom.
For OpenStreetMap exercise, you can check
Problem 1 from this GitHub repository.