Board Thread:Support Requests - Getting Started/@comment-30138685-20171106230112/@comment-24253265-20171107054915

No much guessing needed, generally users can "rename" most pages leaving a redirect from old_name to new_name. Obvious exception, the intended new_name already exists. Less interesting, old_name should be deleted, then an admin could really rename the page without leaving a redirect.

Alternatively Special:MovePage/old_name to new_name can be handled by an ordinary user, this user could then tag old_name with  or similar, and an admin could later delete old_name.

If old_name is protected Special:MovePage/old_name won't work for ordinary users, IOW, ask an admin. Renaming categories is tricky, so don't try that unless you know how it works. Renaming files (image, video, audio) requires file rename rights (admin or somebody else with this right), so also don't try that unless you have the required right.