Dont expose Castled King....
While exposing the king that way was pretty weak, I'd say the much worse move by white was putting his knight on f6 later, giving it away for free. The earlier mistake could have been overcome using that knight to aid in the defense, but instead, white lets black have the knight for free and put his queen on a better square while doing it.
--Fromper
Castling is helpful to protect the king and to bring out the rook. Dont compromise that sweet defense by grabing a piece with a pawn ever or this could happen to u...