Let's set the scene. Say you are a web freelancer and are almost finished with a client's new website. Over the years, you have learned the hard way not to edit the files directly over FTP. It's too easy to make breaking changes with no record of what changed and who did what. Nowadays you are using Git to manage the version of the files. Let's cover that, and also the last mile: deploying only the files known to be changed to the server.