For new editorsEdit
It's very simple to start, even if you haven't worked with a Wiki before. Don't worry about doing something wrong, you can't break things. Any change is undo-able.
Here some introduction:
Getting started - The Basics - How to register and edit a page
Editing in Depth - Explained in pictures and video tutorial
Sandbox - Use that one to try out editing, if needed
Using Templates - To create LSL Function pages and edit other pages, please use templates. There are many templates already created and more will be available soon. If you don't know or understand how to use templates or they are not available yet, just create/edit pages without them for now.
Go on and create the pages you think are required or content you would like to see. Any contribution is a step forward, no matter how good or bad you are ;) Everything can be improved.
The first thing you could do is as example, to edit your own Userpage and write something about yourself and then add it to this list:
I will move those later on their own Users Section!