King and queen against a lone king is the most common winning endgame in chess, and it can't be done by the queen alone: she can herd the enemy king to the edge, but she needs her own king's help to deliver the final blow. The pattern: box the king in with queen a knight's-move away, march your king up, then mate on the edge.
Two finishing shapes cover almost every case: the queen lands directly in front of the king, protected by your own king, or she mates along the edge itself. And one warning that decides more of these endgames than anything else: watch for stalemate. Boxing too tightly before your king arrives throws the whole win away.
White's king has arrived on e6, directly facing the black king. The queen is ready to deliver the final blow.
Deliver the classic supported-queen mate.