Reversi doesn't have one particular winning strategy. Rather it
has strategic elements which can be used to help one gain advantage. Some
strategies, such as trying to flip as many of your opponent's pieces early on
in the game, should be avoided.
Much has been written on the topic of strategy for the games
Othello and Reversi.
If you are interested in learning about specific strategies for the game,
the following links may be of interest: