Curated tags, including canonizing one variation of a tag and making all the others with the same meaning synonyms: https://archiveofourown.org/wrangling_guidelines/16

Of course, where a single word has two or more meanings, synonyms don't make sense, so go with Wikipedia-style disambiguation.

Also be aware if your community has specialized jargon, uses multiple human languages, patois, creole, dialects, or pidgin.

Allow multi-word tags, but settle on a single casing/separation and enforce it: camelCase, snake_case, and kebab-case are some choices.

Prefer plurals "landscapes" over singulars "landscape".

See also https://web.archive.org/web/20050426210018/http://ideant.typ...