http://www.gitguys.com/topics/git-and-remote-repositories/

Commands discussed in this section:

git clone
git pull
git push

“Here is The Git URL”

For many people, the first time they use git occurs when somebody says: “Our source repository is in git. Here is the git URL”. You might be given a URL that looks like one of these:

http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
ssh://user@host.com/var/git/project.git
git://git.debian.org/collab-maint/usplash.git
file:///var/git/project.git

The URL describes where the repository is located and what protocol (http, ssh, git, local file, etc.) to use to get it.

To get started with a git repository, all you need to do is type git clone followed by the URL you were given.

You don’t have to understand the details of remote repositories to work with them. Typically, if you want to participate in a project using git, you can follow this standard workflow:

git clone URL:
After you have done a git clone, you have a copy of the complete repository.
Make some changes to the local version of the repository, then git add and git commit the changes to the local repository.
git push to publish the changes (“commits”) to the remote repository
Periodically git pull to retrieve any new updates from the remote repository.

That’s all there is to it for the typical case.