Wiki __Categories__ are conceptual groupings for organising the contents of a Wiki.

Each page in a wiki site may belong to one or more Wiki categories. 

In order to mark a page for inclusion to a special category, just link to the category page from the bottom of the page. As an example, consider a page describing an interesting idea you want to organize under an "Ideas" category:
{{{
...(content of an example page)

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Back to [Category Ideas]
}}}

The benefit of this linking is that others may follow your link to the ''Category Ideas'' page, and once there, can see all pages referring to ''Category Ideas'' with the
referring pages plugin. Please be verbose with your category link; ''Back to ...'' or
''More ...'' helps navigating pages more than just a link hanging at the end of a page.

If you want to create more categories, feel free to do so. Just create a link 
to [[Category ~YourNewCategory].

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If each ~CategoryPage, itself, links to ~WikiCategory (this page), we can use
the referring pages plugin again to list existing categories, and avoid editing
this page everytime a new category is added. Yay for minimum maintenance.

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!!Existing Categories

[{ReferringPagesPlugin include='Category*'}]