What I do in tournaments is play very tight- passive in the early stage , starting with 100BBs , and play the top 5% of card combinations (10s to Aces , A10 to AK , cuto off , and button if I am first to bet i'll try to steal the blinds with suited connectors and above, but always cautious )
Middle stage is where you have 20-50 BBs left and the goal is to get in the money, and where you start to be more aggressive than in the early stage , play the top 10% of the top card combinations , and when first to act on cut-off , button , SB , always steal the blinds and put pressureon the short stacks
Bubble/ in tha money stage , is where you will have 8-15 BBs and is a ladder stage , you become tight aggressive , ( all-in or fold type of scenario) here is where you are put in tough spots where you might have to fold good hands just because to many people comitted to the pot and your chances of winning the pot are getting diluted. Usually in this stage is where you double up 2-3 times and go to the Final table Bubble period
top 12-18 stage of the game you swithc again your gameplay , becoming aggressive to consolidate your stack for the final table. put massive pressure on the blinds and on the short stacks