[xwiki-users] XWiki document sections

I read in display macro documentation that you can display a section? But how do you specify a section in a document? I would like to understand this using the wysywig editor and using wiki editor? And what velocity code would give me a section header and a section body (without the header)? The only thing I can think of is the heading levels in the wysywig editor, but a document that has a header (level 2) and some text below the header does not seem to have sections if i call #set($menuSections = $menu1Document.getSections())