In a tournament, your strategy evolves as the game progresses due to changing stack sizes, blind levels, and player tendencies. In the early stages, it's crucial to play cautiously, focusing on strong hands while building a solid chip foundation. As the tournament shifts to the middle stage, aggression becomes more valuable, taking advantage of players clinging to their stacks and exploiting weaker opponents. In the late stage, with higher blinds and shorter stacks, pressure increases, and survival becomes key. You need to be more selective with hands, leveraging position and aggression to steal blinds and protect your stack, aiming to push opponents to make mistakes under pressure.