The Wiktionary equivalent of citing sources confuses me.

https://en.wiktionary.org/wiki/Wiktionary:Criteria_for_inclu...

Which words should be attested? Presumably only uncommon ones? And how is it done, is the "quotes" section the attestation? Is there vandalism to clean up, like people adding their own names to define themselves as awesome? Wiktionary seems to "just work", and I don't really understand what holds it together.