Topic on Forum:Trope Talk
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Answering the second question first: You can practice your edits in Sandbox.
As to what Sandbox is and how you can use it: Sandbox is a set of pages that are deliberately kept out of the "Main" space were all the articles are kept. They're otherwise just like any other page. You shouldn't be able to break anything by playing in a Sandbox, so you can use it to try out new markup and new gadgets without affecting anything else.
Each User has his or her own Sandbox. Mine is at User:Robkelk/sandbox - I use it as a place to keep track of my ongoing projects. Yours is at User:Jade Shauni/sandbox