does "la hindii " exist also ? If yes, what would be the difference with "laissa hindii" ?
It's not common to say لا عندي ... in fact, i think it is kind of wrong.
However, you can say لا وشاح عندي (no scarf at me).
What about ليست عند or ليست عندي.( leestu eind/ leestu eindee)
The word ليست (laysat) is used for a feminine object.
However, this way of saying (i don't have) is kind of "weak" - there are better ways but i guess Duolingo want to keep it at a basic "travelers" level.