Wikipedia:Categorization dos and don'ts

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Categories are a vital tool for navigating Wikipedia.

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|+ When categorizing pages:

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! style="background:#efefef;" | DO:

File:Green_check.png‎ Use the most specific categories possible.
File:Green_check.png‎ Categorize based on defining characteristics.
File:Green_check.png Add pages to multiple categories in overlapping trees.
File:Green_check.png‎ Provide sort keys or a {{DEFAULTSORT:}} key.
File:Green_check.png‎ Add cleanup templates where needed.

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! style="background:#efefef;" | DON'T:

30px Don't add pages to non-existent categories.
30px Don't categorize based on trivial characteristics.
30px Don't add pages to non-neutral or unverifiable categories.
30px Don't categorize fictional subjects together with real ones.
30px Don't apply maintenance categories directly: use templates.

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See also