I should place my X at the top-right position (0,2) because this will create a diagonal line of three X's from top-right to bottom-left (positions 0,2 → 1,1 → 2,0). This is an immediate winning move that completes my diagonal. The other available moves (0,1 and 2,1) don't create a winning line, and if I don't play at 0,2, my opponent could place an O there on their next turn to create a vertical line of O's on the right column, which would cause me to lose.