As you start editing on the community if you are familiar with Markdown formatting lanugage you’ll find you can use those formatting tools on the community. This system allows you to write in plain text with simple markup language that is converted to HTML once you have completed editing.
The editor supports the Commonmark version of Markdown, which is an effort to standardize Markdown.
For a quick cheat sheet reference please see http://commonmark.org/help/. If you aren’t yet familiar with markdown there is a 10 minute tutorial on the help page to get you started.