Just play tournaments. They will most likely get you to push/fold mode at some point, if not multiple times. It's all about understanding which are the best situations to push. It's not all about the cards, either. You need to take many other variables into consideration. There have been times where I'd fold something like AJ and push a few hands later with 98. You have to experience these situations to learn. Also, don't forget about re-steals. Once your stack gets to the 15BB - 25BB range, re-steal shoves become extremely effective against MP/LP opens.