Used κοριτσι and it said "wrong: κοπελα" but i've only see κοριτσι before and it seems to be the same in the description, why did it say wrong?

Why isnt it η κορίτσι? Το denotes a masculine noun

Pretty sure the word ‘you’ was not introduced earlier...

This asked to translate the sentence into Greek, but when it gave the answer it showed all english letters...

What wrong word?

I used σου for you, but was told it should have been συ. Why is this? Object v. subject perhaps? Thanks.

What is the difference between Εγώ and Εσύ?

Why isn't it ενα κορίτσι? I thought you had to use ενα before the word girl?

Why isn't it αυτό το κορίτσι for "this girl"?

Why το and not η?