Noob question: Pushbotting

I'm reletively new to playing poker online, only been at it about a month. I've been reading this forum a lot and I notice that almost everyone wants to push most hands in three up/heads up play. What type of hands, generally are people pushing on the bubble, three-up and heads up? Its hard for me to believe you are pushing this often and getting a 40% ITM or 20% ROI

[Nicholasp27]

search for ICM and buy snganalyzer-pro

when u have <10bbs, u should be pushing/folding pf

what hands u should push depends on blinds, stack sizes, if u are first in pot, villian card ranges, how many villians are left to act after u, and, lastly, your cards