The best place to start is Learn how to download and use Git with Dreamweaver CC.
To answer your questions and assuming that you will be using GitHub:
Thank you for your answers.
Yesterday I have installed Git on my machine then initialized a repository directly from Dreamweaver (not from Github as I don't have an account yet).
So, as I'm just using Dreamweaver + the Git client , so where and how can I see this public repository on my browser? And get the URL? Or maybe the operation I did yesterday is just local on my PC and there is no URL until I create a Github account?
By default where is it Is it hosted?
I'm still a bit confused
you seams confusing the GIT client and the GIT server...
Git client is like Filezilla, Cyberduck, Fetch, Cute FTP and so on...
Git server, is most of the time a HUB out there like Bitbucket, GitHub (just because this is among everything a social sharing network)
but one can set our own Git server for pure private use... (one also can open a premium account on most of the previous named hub...)
so if you just play Dw and Git... alone... where is it hosted... well... on your local web site folder
Thank you both for your help