• All content pages (articles) should belong to at least one category which is not a maintenance category.
    • Disambiguation pages and redirects are not considered articles in the sense of this rule.
  • A content page should be placed in all the categories to which it logically belongs.
  • A content page should be placed only in the most specific category (or categories) out of a given branch of the category tree. The question you should ask yourself is: Is category A a (more) specific version of category B? If that is the case, the page should only be in category A. For example, a character who appears in Alien Resurrection should be in Category:Alien Resurrection characters but not in Category:Film characters (because "Alien Resurrection characters" is a specific version of "Film characters"). A character who appears in multiple films should be listed under every film's relevant category.
  • An article should always be categorized by characteristics of the topic, not characteristics of the article. A character article that contains information on the events of a film, for example, does not belong in Category:Theatrical films.
  • An article should never be left with a non-existent (redlinked) category on it. Either the category should be created, or the link should be removed or changed to a category that does exist.
  • User pages should not be placed in content categories. They may be placed in certain categories which explicitly allow to do so, otherwise they should remain uncategorized.
  • Maintenance categories are usually added through the use of maintenance templates, please don't add those categories directly to the category bar. Instead, you should put the maintenance template at the top or bottom of the article.
  • Also always check the description for each category before adding it.
  • Categories need to be written and capitalized properly in order for them to work.
  • A list of all available categories can be found here.
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