Thread:The S/@comment-995426-20170618002134

While it's certainly good practice to categorize templates, it's important to use   tags if you don't want the template's category to be embedded directly into articles (thus also adding those articles to the category). Inside these same tags you can also add template documentation so that the template page reads like a useful maintenance article.

A different optional set of tags,  , has the opposite effect, ensuring that whatever's inside those tags is only embedded with the template and does not appear on the template's page itself (except when editing or viewing the source).

And by the way, Template:citation should probably be renamed, as that name implies that it is used to provide a citation, rather than requesting that a missing citation be given. I suggest the name Template:citation needed, which is what Wikipedia uses, along with redirect aliases Template:cn and Template:fact. 