If you have your git repositories scattered from here to Zanzabar, you might consider using git.colby.edu. It is designed for private as well as group or class based repositories. If you wish to get your own repository and access to the server send an email firstname.lastname@example.org.
A bit of good documentation to start can be found at the git novice training from the Software Carpentry group. Another good resource, but from the enterprise implementation level from Atlassian about why we should use git (ignore the bitbucket sales pitch).
You should also take a look at (Colby College only!) online safari book access and the text on Version Control with Git.
How do I make it work?
You will need two terminals for this.
Change <colbyid> to your short form colby email (without the @colby.edu!)
In Terminal number one
git —bare init
in Terminal number two
git add readme
git commit -m ‘first try’
git remote add origin ssh://<colbyid>@git.colby.edu/git/repositories/colbyid/example.git
git push origin master
Go back and explore what you find in git.colby.edu:/git/repositories/colbyid/example.git