Tournaments. Most people start tournaments by playing tight while the blinds are small and just trying to survive and slowly chip up until the latter stages. As the blinds and antes rise and become a bigger percentage of your stack you get more aggressive. When you have less than 10BB you get very aggressive. A large part of most online tournaments is played with average stacks of 10-30BB. Most pots seem to be won with starting hands that are pairs or high cards (AK, AQ etc). When you lose in a tournament your fun is over, so most people do not want to gamble unless they have a made hand or great pot odds.
Cash games: Cash games are often played with very large stacks (100 or more BBs) and if you lose your stack you can easily rebuy. So there is no fear of ending your fun. If you have a draw and reasonably good odds you go chase those cards. When you hit the pot tends to be huge. Therefore starting hands in cash games are often small cards and connectors or 1-gappers (9-8, 7-6, 10-9 etc). In fact AA, AK and KK are often cracked by 2 pair, sets and straights or flushes. These large hands need to be played quickly in cash games to stop people drawing out on you. Position is really important in cash games. You really want to be the guy to act last. And mistakes (yours or someone elses) are massively important. You can play a cash game for hours patiently chipping up and then lose your whole stack with one bad mistake. Good players are extremely patient as they know they make most of their money on a few big pots that only come around once in a long while. Good players also practice hand reading. It is extremely important in cash games to be able to get away from a second best hand - you can only do this by putting your opponents on a range of hands and trying to determine which is the most likely one they are betting with. This is a big skill and a key part of being a good cash player. You also need to be able to counter other cash players from reading your hand by being deceptive - making your set of 8s look like top pair top kicker.
So there you go. Nothing to it. Except that even when you think you have it figured out, it still does not work........
I will detail some of the strategies Ive been using in future posts. I am trying to find the right mix of patience, aggression, bluffing and skill. While I am searching for this mix, I will bleed money out of my bankroll. I will lose, lose and lose some more. I am philosophical about this - eventually I will win, win and win some more. I hope!