Markdown challenges

The documentation for markdown within neodash points to the github markdown documentation, however the rendering doesn't seem to be particularly faithful to this markdown syntax.

I can't for the life of me figure out some very basic formatting functions (like adding a line break/newline)
I've tried several markdown methods for this to no avail.

parameter substitutions, headers, list items, bold all work as advertised, but how can I get a newline?