I remember asking somewhere in one of the exercises about the position of small words like nic, which, I saw, would usually be placed at the beginning of a sentence.
Is "Nie wiesz nic o niej" wrong or is it a question of emphasis?
It's okay, it works.
You do not know anything about her.
Works, of course.
what are the situations when we have to decline "nic"? is it possible at all to say "nie wiesz niczego o niej"?
Which of the words in this sentence is "her" and in which case is it?
"niej". It is Locative, because it's "about her".
I think it would be extremely helpful to put the case in the hints for pronouns! It would eliminate the need for some guessing
Unfortunately that's the opposite of what Duolingo wants us to do, because it messes with the puzzle exercises.
If "you do not know anything about her" works, like written above, why is "you don't know anything about her" marked wrong?
"you don't know anything about her" definitely should have worked.