This is the sandbox, or test area. You may practice your wiki skills below.
you can create an intentional dead link just by adding [[sample page]] that looks like this: sample page
-then someone else can click on it and create the new page.
Here is a good site for beginners: https://meta.wikimedia.org/wiki/Help:Wikitext_examples
A good process I use often is clicking the Show preview button below, I sometimes use it 3 or 4 times before I'm happy with the results, and hit save changes.