Here is a short description of how things are categorized on Whatnot:
Mint: Item and/or packaging are great condition and both have no clearly visible defects or damage
Near Mint: Item is in great condition along with packaging but may have up to 2 minor bits of damage.
Good: Item has is not broken, but. may show some signs of wear along with packaging
Damaged: Packaging may be heavily damaged, but is still in one piece where applicable. Item may show signs of significant wear but is not broken
If you are selling something, and in doubt of an items condition, please tag it conservatively, so you don't disappoint a buyer.