From a page move: This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.
From a subpage: This is a redirect from a subpage. In a page title, a subpage name appears after a solidus (/); for example, "Wikipedia:WikiProject Cricket/Articles", which is a subpage of "Wikipedia:WikiProject Cricket", redirects to Template:CricketRecentChanges. Not all articles or other pages with "/" in their titles are subpages (e.g. CP/M).
If this redirect is in mainspace, then it will populate the Redirects with old history category bold-linked above; if in any other namespace, then Category:Redirects from subpages will be populated.
If target page is not a template, then use {{R from shortcut}} instead.
Template shortcuts are wikilinked on community pages, talk pages and edit summaries, but not in mainspace articles. Transclusions in mainspace are common and do not need to be "fixed".
Note:Template talk pages are in a talk namespace; they are not in the template namespace. All shortcuts to talk pages should be tagged with {{R from shortcut}}.
When appropriate, protection levels are automatically sensed, described and categorized.