This template is used on a very large number of pages. To avoid major disruption, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.
To a redirect category (rcat) template: This is a redirect from an alias/shortcut (usually), or from a redirect that is the result of a page move/rename, to a redirect category (rcat) template.
From a shortcut: This is a redirect from a shortcut in any namespace to a page in any namespace.
Shortcuts are wikilinked on community pages, talk pages, and edit summaries, but not in mainspace articles.
When appropriate, protection levels are automatically sensed, described and categorized.