Redirects are very helpful. Even if someone misspells something, if a redirect is in place, it will send them to where they need to go. The downside to this is that many people will link to redirects in articles (such as linking to "Fox" instead of the correct "Fox McCloud"), and this will create inconsistencies in Wiki links. Be sure to fix these as you see them by using piped links!
To create a redirect, create a page as you normally would, but make the only content of the page this:
Replace "page" with the article you intend to redirect to. Note that redirects can also contain categories, which is occasionally useful when something has been merged into another article but still needs its own category.