Save a file in a repository (commit)
To edit a Markdown file like a readme you should have a look at the syntax of Markdown. Because you can create headings, list items, links and more to make your text clearer. Markdown is a very simple format and is used in more and more areas like wikis or issuesystems.
In Git systems it is necessary to leave a small message (commit message) of what or why you made a change (commit). You can leave a title (required) and a description for a commit. The description is only needed if the title is not sufficient. But a meaningful title would be great!