Nice article with some beginner facts about geese.
The part about not feeding them medicated feed is partially incorrect - unless the feed is medicated for blackhead prevention, it's generally fine to feed geese. 'Medicated' feed is usually feed that has amprolium in it to prevent coccidiosis, and it will not cause waterfowl any harm. They don't need it, however, so there's no need to feed it unless it's the only feed you can get.