Limit Hold-Em (On Line)
  
  OK, now it starts to get dicey.    
 

The first thing you need to do is to look at the flop cards (disregarding your pocket cards) and ask yourself "what five card hands could these cards help to make up?"

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If, for instance, the three flop cards are all suited, and you don't have any of that suit in your pocket, it's time to start thinking of throwing away your hand.

   
  The possible exceptions to this would be if you have wired aces or maybe kings in your pocket and there is another ace or king in the flop, you should probably stick around to see if you can draw a full house or the fourth ace or king.    
  Other than that, if you are playing at a pretty full table, it is probably safe to assume that someone at the table has a pair of whatever suit the flop is and will therefore beat you.    
  Wired pairs are good before the flop, but if after the flop you turn out to have a pair of the lowest cards you should probably fold it rather than call a bet, because it's a fair assumption that if someone bets after the flop has come out with three unrelated cards that they either have paired or on the come. If they have paired you automatically hold the second best hand with no better chance of improving to beat him than he has. If your opponent is on the come then it become a game of betting the pot odds as to whether you cal him or not as you are a slight favorite but you must be relay sure of your "read" that has put him on the come as opposed to holding a pair of whatever has flopped and will beat you automatically    
  Drawing on the come (and for that matter, staying in a pot on the come) is really a judgment call. If say you stayed in to see the flop with a suited paint and the flop came up with two of the suit you are looking for, your odds of drawing that remaining suited card are slightly better than one in six. Reduce this by the chance of someone else having a higher card in that suit and you get the right formula to calculate pot odds.    
  In other words, say for instance, you called the blind with Qh, 7h and the flop came Jh, 4h, 2h. Three players in front of you have called (OK the first bet and the others called) and you're on the button (so you don't have to worry about what anyone behind you is going to do). You know that there is no possible straight (well, there is but if someone's on the come for that low of a straight you don't have much to worry about from them) so you now have a two card draw to get another heart (slightly better than 5 to1 odds) and two bigger hearts to worry about (Ah, Kh, either of which are logical hold cards before the flop, so if someone had them the odds are that they didn't fold them) Which brings your odds of being successful up to about 12 to 1. Now, most people with a little "gamble" in them don't hold strictly to pot odds but it's always a good guideline to tell you where you really stand.    
  It gets worse from there. I know you can't always be playing the nuts but it's always the position to strive for.    
  In calculating odds, we always assume a full table (10 players) and work from there. In Hold 'Em you always have to remember that if you have a full table only 1/2 the deck will be seen by someone (actually one less than 1/2) in any given hand.    
  The game that you should be constantly playing with yourself is this; What is the possible best hand represented by the cards on the board and how bad is my hand in relation to that.    
  The odds that someone at the table will make a better hand than you goes up as the number of players increases!    
       
 
Required Reading
    
  As always I advocate a complete education. Some of the best books that I've found on Poker are: Caro's Fundamental Secrets of Winning Poker and The Body Language of Poker: Mike Caro's Book of Tells.