Its primary purpose is to act as a for your commit message. When you run git commit (without the -m flag), Git opens this file in your default text editor, allowing you to write, review, and edit the message before the commit is finalized and saved to the database.
git config --global commit.template ~/.gitmessage.txt COMMIT-EDITMSG
You can change which editor opens the COMMIT-EDITMSG file by configuring your global settings. Its primary purpose is to act as a for your commit message
To write a good COMMIT_EDITMSG (the temporary file Git opens for your commit message), follow the widely accepted 50/72 rule allowing you to write