I agree, they really need to be better on explaining the fees and minimum amounts so things don't get lost in the weeds of tiny fractions of crypto. (I have about 5 or 6 cryptos with super tiny amounts of them leftover after trading them, like you said, dust, that I can't really trade unless I buy more, etc.) For now, it's just mostly trial and (lots of) error. But that is mostly their fault for not communicating in better ways. While it can be fun to guess how (some) things work, it's not exactly pleasant when it comes to financially related things.