Niko, I'll help you out here if you're interested in moving it to the FAQs.
<a href="http://foo.bar">link text</a>
<code>code</code> (or just use backticks—you're essentially telling the forum's html parser to print everything contained inside the tag as a string)
I doubt anyone will use any of the others. They're standard html list tags if anyone wants to find out more.