Whitespace and HTML have a troubled past and TightWiki tries its best to be intuitive with both maintaining whitespace and minimizing excess whitespace.
Any new-lines/empty-lines you leave in a page source will be converted to a HTML line-break. However, when this will lead to more than one line-break being inserted. the engine will collapse half of them. This allows you to put spacing in the source to make it readable while controlling the resulting page body.
A few functions exist to help you add whitespace. (Note that NL() and NewLine() both do the same thing, one was added for brevity).
##NL( <optional count of new-lines, defaults to 1> )
##NewLine( <optional count of new-lines, defaults to 1> )