Using GitHub for Windows
(note: as @mawburn stated, there isn’t any free private repos on GitHub, so you may want to use SourceTree – see next post)
Yep, from there you can create a repository, and import your initial set of code, for client 1 (if you like to have your projects separated by client).
So click the + sign in the top left corner,
Name: Enter the Client’s Name for the repo (using dashes instead of spaces)
Local Path: Navigate to the folder containing that client’s code
Click on Create Repository.
Now you have it created, DW may detect this if you close it and reopen it (I’m not sure about that as I’ve never used DW).
The above step should import all of the folders/files for your client’s site into your newly created GIT repo. As you make changes, you will need to commit them and push them to the repo (note the two steps, commit and push).
If you make changes somewhere else, or on a different PC and you commit and push them to the repo, you can then PULL them to your other PC (note: pull).
That is the “real real basics” of git. There is a lot more you can obviously do, and will do as you get in the habit of it, but this is enough to get your feet wet.