Categories (along with other features like cross-references, lists, and infoboxes) help users find information, even if they don't know that it exists or what it's called.
Every page in Romance Wiki should belong to at least one category. Include the categories which are the most specific topics to which the subject of the article most closely belongs. This is the category where users are most likely to look if they can't remember the name of the thing they are trying to look up or where they can browse. Do not use the top categories which are general categories that include other categories (for example, don't use category:Books), but choose a more specific category (category:Historical Romance).
In Romance Wiki the main topics are the top categories in the contents box below.