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 modification: This is a redirect from a modification of the target's title; for example, its words are rearranged, or punctuation in the name is changed. In cases of modification from distinctly longer or shorter names, please use {{R from long name}} or {{R from short name}}, respectively.
From a convenient title: This is a redirect from a title that is intended to make it easier to get to the target page; the target is a more appropriate page for the purpose of the redirected page. Since many types of redirects may fall into this category, this rcat should be reserved for redirects that do not fit other descriptions.
For example, this may be a redirect from a title that is another name, a pseudonym, a nickname, or a synonym as is used colloquially, but is not currently an officially accepted term, though it may have been in the past. It leads to the title in accordance with the naming conventions for common names and can help writing and searches. However, do not replace these redirected links with piped links unless the page is updated for another reason.
For more information follow the bold category link(s).