I'm choosing the top-left corner (0,0) as my first move because the opponent has taken the center position. By placing my O in a corner, I can work toward creating multiple potential winning paths - along the top row, the left column, and the diagonal. Corner plays are generally strong strategic options when responding to a center move in Tic-Tac-Toe. This gives me the most flexibility for future moves and forces my opponent to play defensively.