Welcome to the Call of Duty Wiki's sandbox!
This page exists so that you can practice editing or formatting (see Editing help) without changing any serious content. Feel free to try wiki-editing out here first.
There is a tutorial on the Central Wikia that will step you through more of the things you can do.
Wiki allows for rather complicated formatting. It can look overwhelming when you begin, but just start with the basics... enter some text, and learn the other pieces as you go. Your content contributions are welcome and important. The wiki is a collaborative effort and others can help with formatting and other improvements.