Git saves your system config in /etc/gitconfig , user config in ~/.gitconfig or ~/.config/git/config and repository config in .git/config
Each config will override the previous one so the repository config will override the other config
Config your username and email:
$ git config --global user.name "fx-moon"
$ git config --global user.email fx-moon@outlook.com
To get all the config you can use
man git-configor http://git-scm.com/docs/git-config.html .