Help:Contents
From HellWiki
The MediaWiki has this to say about editing wikis:
The number one rule of wiki editing, is to be bold. Dive in and make changes. Other people can correct mistakes later, so have confidence, and give it a try! There can be all kinds of editing conventions, rules, and philosophy governing the editing of wiki pages, but the "be bold" rule overrides these! In general try to write clearly and concisely and make sure you are always aiming to do something which improves the wiki contents. An edit might be to contribute whole paragraphs or pages full of information, or it could be as simple as fixing a typo or spelling mistake.
They also have some stuff about wiki tags and links and whatnot:
