The most common strategy for SNG is to play tight in the early stages
The most common strategy for SNG is to play tight in the early stages, and then build up aggression when the blinds start to grow and the stacks become short. When the stacks become about 10 BB, it's time to play push-fold. At this time, you have almost no opportunity for postflop games, so you need to master the correct and timely placement in all-in.
This strategy is followed by most SNG-regulators. But there is another option - from the very beginning to play in loose-aggressive style, in order to quickly fill a large stack, and then not be afraid of the bubble stage and punch opponents. Such a strategy can lead to confident victories, but it is more risky, which means that such a game will be more dispersive.