When [editing pages|TextFormattingRules] just keep the following rules in mind:

!!General
** Write in a way that is easy to understand and avoid local slang or phrases. Many of those who will read your text may not have English as their first language.
* Don't use too many acronyms (or at least, have a page explaining them)
* __Avoid the ''"click here"'' phrase!!__ Don't say: "More info about etiquette can be found [here|WikiEtiquette]" but use "More info about etiquette can be found at [WikiEtiquette]". I'd suggest avoiding it for external links as well.
* Contribute only original stuff.  Links are fine, but don't cut-and-paste from copyrighted things.
* Correcting typos is quite okay - in fact, it's a very good habit, since it makes the web page more readable.