To redirect page A (the redirecting page) to a different page B (the target page), enter the following redirecting command at the top of the redirecting page.
#REDIRECT [[NAME OF PAGE B]]
Do not make double redirects (a redirect that points to another redirect); they do not work (to prevent endless looping, a redirect will not "pass through" more than one entry; if someone is redirected to a redirect, the chain stops at the first redirect), they create slow, unpleasant experiences for the reader, and they make the navigational structure of the site confusing.
Double redirects are usually created after a move when old redirects are left unchanged and pointing toward an old name.
Another type of undesirable redirect is a self-redirect: an article that redirects to itself through a redirect.