Ever student will commit his code in the following repository. Every student-group will use his own branch.
You can look at other poeple's code, copy past it if you like it, but always mention your source (maybe fellow student) in the code-block you took over.
If you have a specific question, you can create an issue, but always mention the name of the branch. Everything you share here is public, please keep that in mind and respect other persons privacy.