Three levels of GIT config

.gitconfig

# There are 3 levels of git config; project, global and system.

# project: Project configs are only available for the current project and stored in .git/config in the project's directory.
# global: Global configs are available for all projects for the current user and stored in ~/.gitconfig.
# system: System configs are available for all the users/projects and stored in /etc/gitconfig.

# Create a project specific config, you have to execute this under the project's directory.
$ git config user.name "John Doe"

# Create a global config
$ git config --global user.name "John Doe"

# Create a system config
$ git config --system user.name "John Doe"