Help:Etiquette
These are guidelines you should follow, so that everyone editing the wiki is happy. Of course, these are just guidelines, and there are exceptions to be made.
User pages
Please refrain from editing another user's user page, unless it or the user is causing some problem (e.g. spamming).
Talk pages
Sign your messages using four tildes (~~~~). If you do not sign your messages you will get the "unsigned" message of shame added to it later.
Major changes
Before you make very significant changes to the wiki (like changing the entire structure of something), discuss it on a talk page. This doesn't apply for pages that you're simply making a lot of changes to, such as (example of a time it's okay to go along without discussing).
If no one else responds to your messages about major changes, wait a while and check where the edit is in Special:RecentChanges. If it's low on the page, consider editing the talk page again to bump it back to the top. If you still have not received any response after a few days, consider your changes okay to do.
Templates
The documentation is there for a reason. READ IT.