Poker is an observation game. Therefore, the first step in determining the style of players is to observe their general trends. This factor is the key to success in poker. Studying the trends of your rivals is considered mandatory, especially if you plan to become the winner of the tournament. Every action that the enemy commits already means something. Why did the player make an x-raise from this position or just call? It should be emphasized once again that you should always follow the game, especially when you are not involved in distribution (which can be in most cases) in order to understand what your opponents think and how they will act.
But, of course, depending on the situation. Depending on which tournament you are playing at, at which table, which steak you have and which players are at the table. But basically I play passively, at the beginning of the game I watch, carefully look at the players, especially if the blinds grow slowly.