The -m flag lets you add a message for the commit; if you omit -m, Git will open the editor you set in Section 1.3.1 and have you enter the message there.
        It is important to note that Git commits are local, recorded only on the machine on which the commits occur. This is in contrast to the popular open-source version
control system called Subversion, in which a commit necessarily makes changes on a remote repository. Git divides a Subversion-style commit into its two logical pieces: local recording of the changes (git commit) and a push of the changes up to a remote repository (git push). We’ll see an example of the push step in Section 1.3.5.
       By the way, you can see a list of your commit messages using the log command:

To exit git log, you may have to type q to quit.