What are redirects and double redirects?
A redirect is any article that, when visited, redirects the user to a different one. This is usually done when article names contain special characters or there are different terms for the same thing. For example, The Rift redirects to The Rift of Nûrz Ghâshu, and Fellowship Maneuvers redirects to Conjunctions. You can create a redirect page by putting #REDIRECT [[Pagename]] on the page you want to redirect from, where Pagename should be replaced with the target page name. A double redirect is a redirect that leads to another redirect. Since this is unnecessary, these double redirects should be fixed by changing the target of the first redirect. You can find a list of all double redirects here.
