How to answer


ok, then my reply would probably be 2. Nf6. you're fighting for the center d5. after that, i'd expect them to probably do 3. d3, to back up the pawn. you could then reply with 3. e6, to keep up the fight. if they advance the pawn with 3. e5 instead, threatening your knight, you always have 3. d5 to threaten their bishop.
that's one way of doing it...

Having some trouble with it as black.
Thanks