"Yes and no, it depends!" (TM)
Like every ring game is different depending on players, styles, aggression, passiveness, position, opportunity and a myriad of variables. So too are tournaments, if you read some of the articles about tournaments here in CC you'll get the "general" idea of how to play them at different stages but your best teacher will be experience.
Aggression is often the key to tournament play depending on the situation, it can be tight aggression or loose aggression, loose aggression is more dependent upon better than above average stack size and a good read on your opponents while your totally focused. When you have several focused loose aggressive players at your table you need to be tight aggressive, if there are several tight aggressive players at your table you need to be loose aggressive.
If you're average stacked or under average in the late stages of a tournament don't discount tight/passive/aggression, position, position, position, focus and read for opportunity's to double up the action often gets wild around this time. Who's been the most patient at your table? If he comes in for a raise get out! Who's been the most impatient showing down all-ins with A/J and K/Q? PUSH them with A/K if you get the chance.
Really the only answer to your question is... "it depends". And experience will be your teacher, keep playing the tournaments, the more you play the more it will dawn on you how styles, position and opportunities present themselves.
Like learning a new job the more experience you have the better at it you get.