Here are some general tips if you are going to be playing in Texas Holdem multi-table tournaments.
#1 – Early in a tournament try and speculate as much as possible. This is the time of the tournament when the bad players are giving away their chips and you want to be the one trying to get them rather than letting someone else take them. Speculating means calling raises or limping in with hands like pocket pairs, suited connectors, suited aces, and suited kings.
#2 – Avoid playing big pots early. The only time you should play a big pot early in a tournament is when you know you have the best of it. Keep the pots small by making small bets and playing a bit more passively with your marginal holdings.
#3 – Don't let yourself get so short that a raise/shove from you has no meaning. Many players make the mistake of blinding/anteing down until they have 3-5 big blinds and then complain about how unlucky they are when their pocket aces are cracked by 9-7 off when they open shoved for four big blinds and the big stack called their measly little raise. By making sure your stack is large enough, you can get marginal hands to fold and when you do double up, you're not necessarily in the same position you were before... a short stack with one move.
#4 – When the antes kick in, start opening up your game and attacking players who are survival minded. You can tell who these players are... the ones who fold their big blind every time or who fold any time they face adverse pressure. Identify these players and raise their blinds and re-raise them when they raise.
#5 – Play tight early, loose late. Position is such an important part of tournament poker. The later you act the more information you have available to you. The more information you have, the better decisions you make. As such, you should play fewer hands in early position and more hands in later position.
#6 – Observe your opponents carefully. A key part to tournament poker is identifying a player’s tendencies. When they raise from the button is this a play they make all the time or never? If it's a common play, they are more than likely stealing and you can make a move on them. If it's not something they do often, they probably have a big hand and you should fold. Do they only limp in with hands like small pairs and suited connectors but raise with bigger pairs and Ace King? Raise their limps big since you know their range and can make it difficult for them. Call their raises with speculative hands since you know that you can win a big pot if you hit. Being able to identify how players play certain hands can be the single most important thing you do in a tournament.
The Main Holdem Strategy Index: The Great Game of Holdem