Start by examining every check, however briefly. There are two. The first, Qxf5, loses the queen, so the follow-up had better be spectacular; and it isn’t. But then there is Rh6. Consider Black’s possible responses; visualize the rook on its new square. If Black moves the king out of the way—say, to g7, or g5 (taking the knight)—White wins the queen by playing RxQ (another example of a skewer). So assume Black will play KxR. Now how will the board look? White’s knight will be on a dark square, along with Black’s king and queen, which can be forked with Nf7+. So Rh6+ effectively wins the queen.