In the early stages and especially during the first hour of a freeroll tournament, a large number of players will take risks and go all-in recklessly. Quite simply because they do not play with their personal money they therefore have no reserve strategy, they are totally indecipherable players...
On the other hand, you will have to be patient and only play strong hands like pair of aces, or two kings, ace king and choose your spots carefully. The key word is patience, crazy players will eliminate themselves.
Second step, already many players will have left the tournament, you will be able to start playing weaker hands with small pairs. Keep an eye on each player's chip stack. Players with a weak stack will start to despair. You can bluff players with few chips and play cautiously with richer players; this will be a profitable strategy.
Third stage you are now in the middle of the tournament and half of the players have already been eliminated, your objective is now to collect as many chips as possible while limiting the risks before the blinds increase. You can take more risks but don't play with weak hands at the start. The objective is to reach the “square” of players who will be paid. But be careful of players with few chips, you have to face them with good cards because they are just waiting for an opportunity to go all in.
The strategy for the final stages of a freeroll:
There remains the final phases where the strategy will be the same as in any classic tournament, and there your experience and your talent will speak.
In summary we can say that in a freeroll tournament you have to let the storm of the first 10 to 15 hands pass and be content to limit the damage, because even with a good game at the start you risk quickly coming up against many players who are there above all to have fun and will go all-in at every turn.