Puzzle question

https://www.chess.com/puzzles/problem/773064

I don't understand why I got this one wrong. I understand that moving the knight on the second move is good, but why isn't moving the rook to check even better? I figured winning the knight OR rook is better than just winning the knight. 

If you mean on move 2 black can block check with the bishop or move the King to f6 to protect. On that second option, if white moves Ng4+ black picks up the g7 pawn. White still wins the knight but the position evaluation is even , whereas the solution is winning for white.

I think I see what you mean. I didn't think about the pawn. I figured if there is no way blocking with the bishop would work because of rook takes bishop followed by a knight fork. Chess is hard

Great example