When we look at a position, we get our first impression first, before we dive in to count or compare pieces. What I see first is that there are more black pieces on the board.
Looking more closely, we can see that both sides have Queen, Rook, and Knight. White King is safely tucked under the pawns, while black King is separated from his numerous pawns. The black Queen is working like a pawn, shielding the King. Not a good sign.
All three white pieces are on the Queen side, which has the black King and only a few pawns. In the meantime, black Knight is on the King side, almost doing nothing. Black Rook is passively defending a pawn. So all three black pieces are doing three different things. We have not thought about candidate moves yet, let alone calculating lines, but we already know from our first look that white is better.
But how to proceed?
The black King is cut off on h-file. That's a big pain-in-butt for black, and prevents black from initiating any counter attack. So we should continue attacking the King. Maybe we can reach checkmate. But only our least powerful piece is close to the King. The lonely Knight won't overpower black Queen, and it also takes a square away from our Queen's moves.
Rook b8+ is too wild. Queen has to stay on the a6-d3 diagonal to protect our Knight, and we can't move in with Qb5. Now we see a problem: we can't move in our Queen! If we see a problem, then we can start working on the solution. If not, we either have no ideas at all or the puzzle is too easy.
Thinking about moving away our Knight so our Queen can either have a square a6, or freely move to b3, naturally we consider Nc7+ check first. Check is the first thing on the list "Check, Capture, Threat". Checking is also a forcing move. Here black Queen has to take. After that, a6 square in fact is available for our Queen, and we can easily follow up with a mate.
Nb4 is blocking our Rook so should not be considered. Nc5 is setting up a trap and wishing for the best. Beginners do that, but it won't work, because black won't take the Knight. We have to think the best moves for both sides.