The answer is
On Windows 10 this worked for me for VIM and VI using git bash
"Esc" + ":wq!"
or
"Esc" + ":q!"
Since you are learning Git, know that this has little to do with git but with the text editor configured for use. In vim, you can press i to start entering text and save by pressing esc and :wq and enter, this will commit with the message you typed. In your current state, to just come out without committing, you can do :q instead of the :wq as mentioned above.
Alternatively, you can just do git commit -m '<message>' instead of having git open the editor to type the message.
Note that you can also change the editor and use something you are comfortable with ( like notepad) - How can I set up an editor to work with Git on Windows?
First type
i
to enter the commit message then press ESC then type
:wq
to save the commit message and to quit. Or type
:q!
to quit without saving the message.
That's the vi editor. Try ESC :q!.
There is a default text editor that will be used when Git needs you to type in a message. By default, Git uses your system’s default editor, which is generally Vi or Vim. In your case, it is Vim that Git has chosen. See How do I make Git use the editor of my choice for commits? for details of how to choose another editor. Meanwhile...
You'll want to enter a message before you leave Vim:
...will start a new line for you to type in.
To exit (g)Vim type:
It's worth getting to know Vim, as you can use it for editing text on almost any platform. I recommend the Vim Tutor, I used it many years ago and have never looked back (barely a day goes by when I don't use Vim).
On windows I used the following command
:wq
and it aborts the previous commit because of the empty commit message
On windows, simply pressing 'q' on the keyboard quits this screen. I got it when I was reading help using '!help' or simply 'help' and 'enter', from the DOS prompt.
Happy Coding :-)
Source: Stackoverflow.com