TortoiseGit is a kind of family project with TortoiseSVN and TortoiseCVN, so if you are familiar with that, you will be easy to use it.
TortoiseGit is easy to use, because it is integrated with Windows shell as well as lots of development utilities, but I won't cover about that at the moment.
Install TortoiseGit client
Download TortoiseGit at https://tortoisegit.org/download/