Most of the time, when we work with Git, we will use the command line:

$ git --help
usage: git [--version] [--help] [-C <path>] [-c name=value]
           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
           [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]
           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
           <command> [<args>]

We will create a repository and create a file inside the repository:

$ mkdir TestRepo
$ cd TestRepo/
$ git init
Initialized empty Git repository in /home/echou/Master_Python_Networking_second_edition/Chapter11/TestRepo/.git/
$ echo "this is my test file" > myFile.txt

When the repository was initialized with Git, a new hidden folder of .git was added to the directory. It contains all the Git-related files:

$ ls -a
. .. .git...