To create bold or italic, wrap with asterisks * or underscores _.

To avoid creating bold or italic, place a backslash in front * or _.

A paragraph is consecutive lines of text with one or more blank lines between them.

For a line break, add either a backslash \ or two blank spaces at the end of the line.

Starting a line with a hash # and a space makes a header.

Links can be either inline with the text, or placed at the bottom of the text as references.

Link text is enclosed by square brackets [], and for inline links, the link URL is enclosed by parens ().

Images are almost identical to links, but an image starts with an exclamation point !.

To create inline code, wrap with backticks `.

To create a code block, either indent each line by 4 spaces, or place 3 backticks ``` on a line above and below the code block.

Unordered lists can use either asterisks *, plus +, or hyphens - as list markers.

Ordered lists use numbers followed by period . or right paren ).

To nest one list within another, indent each item in the sublist by four spaces. You can also nest other elements like paragraphs, blockquotes or code blocks.

(http://commonmark.org/help/tutorial/index.html)