To win tic tac toe every time, it would take a lot of practice and skill. You would have to really practice trying out strategies to figure out which one is best. It is almost impossible though to win tic tac toe every time. This is because you may be playing the same player over and over again.
After a while, that player is going to figure out how you are winning every time. In other words, he or she is going to figure out your strategy. If you think of a great strategy for winning and it is not obvious, then you may be able to win tic tac toe every time especially if you are playing different people.