Wikipedia:Categorization dos and don'ts

Categories are a vital tool for navigating Wikipedia.

When categorizing pages:

DO: Use the most specific categories possible. Categorize based on defining characteristics. Add pages to multiple categories in overlapping trees. Provide sort keys or a {{DEFAULTSORT:}} key. Add cleanup templates where needed.	DON'T: Don't add pages to non-existent categories. Don't categorize based on trivial characteristics. Don't add pages to non-neutral or unverifiable categories. Don't categorize fictional subjects together with real ones. Don't apply maintenance categories directly: use templates.

See also

• Simple rule set
• Simple style manual
• Style tips