Push/Fold Strategy on the Bubble
The most important exception to basic push/fold poker is when you’re on the bubble of a tournament or sit and go.
Because of the massive equity difference between bubbling and making the money you need a much bigger edge to justify risking elimination with an all-in.
This concept is best illustrated by the math formula known as the Independent Chip Model (ICM) but as a beginner all you need to know is that if you’re moving all-in or calling all-in on the bubble, you should have a very good reason.
If you think you’re flipping a coin just fold and wait for a better spot.