Opening Question: Pawn takes knight?

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dmksails

I'm a beginner and I'm using the Blue Book of Chess for instruction.  One of the first games is called the Damiano Gambit.  I've inserted the point of question.  Its black's move.  Seems obvious - based on points - that black's pawn should take the knight.  The book says this is a very bad play.  Why?

 

 

krudsparov

Because of, Qh5+ then Qe5+ and black's in trouble.

dmksails

Yes, I see.  I was looking at moves involving the bishop (C4) and queen (f3) , but there seemed to be too many ways for black to block that strategy to make the pawn takes knight move to seem bad.  Thanks!