A common maxim of tournament play is to stay tight in the early stages and wait for big hands. This is a good strategy for survival but ultimately chip accumulation should be your prime directive in a tournament. The first 3 or so blind levels when you have 50-100 big blinds is the time to take a few punts with speculative hands and take small pots from the weaker players at the table and all the players who subscribe to the 'tight early' strategy. There are going to be a lot of players who do not know how to handle a deep stack and will go broke to your set when they have top pair.
Cash games are also probably better practice when you do win a seat to that WPT/WSOP event online, because there you have to manage a very deep stack of 200+ big blinds. All-ins preflop are nothing short of suicidal before the 2nd dinner break in these things and without deep stack management you run the risk of just adding to the dead money prize pool.
Cash sessions will also allow you take a much more logical and structured approach to the hand on every street, in tournaments it is often over by the flop (or at least all the money is in the middle by then) whereas in cash games you have to think in advance about things like 'what will I do if he calls my bluff on the flop' and how to play the turn and river.
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