Paragraphs
The simplest way to enter text into a wiki is similar to doing so in a a word processor.
You just start writing.
The only anomaly is that you have to hit "enter" twice for a paragraph:
Input in the editor form
First paragraph. Still first paragraph. Second paragraph. Third paragraph.
Display
First paragraph. Still first paragraph.
Second paragraph.
Third paragraph.
Dividing rules
Input
First part. ---- Second part.
Display
First part.
Second part.