You cannot always win Tic Tac Toe against a perfect opponent
If you go first, take the center
If the center is taken, take a corner
If the opponent takes a corner, take the center if available
Create two threats at once whenever possible
Block the opponent’s immediate winning move every turn
Force forks by controlling center and opposite corners
Take the opposite corner when the opponent takes a corner
Prefer corners over edges
Avoid giving the opponent a fork
If you go second, play to force a draw against perfect play
Learn all fork patterns
Learn all win-block-win sequences
Do not play edges unless necessary
Keep your moves aligned to build two-in-a-row opportunities
Punish mistakes immediately
If both players play perfectly, the best possible result is a draw