Since my opponent has taken the center position (1,1), I'll place my first O in the top-left corner (0,0). This is a strong strategic position as it gives me potential winning opportunities along the top row, the left column, and the main diagonal. Taking a corner when the opponent has the center is generally a good approach in Tic-Tac-Toe as it maximizes my options for future moves while limiting my opponent's ability to create immediate threats.