The Turn
("Accelerate while gently steering")
The turn is the place where your AKs is beaten by K2 offsuit. Remember that.
The turn is a great place to pump it up or get out of dodge. If you felt you had the best hand on the flop and check raised it there you have a choice. Usually you should bet out the turn but sometimes, if you hand was further improved and if that improvement likely improved one of your opponents as well, you can check and raise again on the turn.
You might think that after checking and raising on the flop that no one would fall for it again. Think again.
Another tactic if you have an especially strong hand on the flop is to just go with the flow of betting and then check-raise on the turn. Because the bet is double-sized on the turn you can get some extra money in the pot. This is especially effective if you hold a hand like:
  |
| Your Hole Cards |
and you flop a king:
   |
| Flop |
and you check raised on the flop. Then the turn brings:
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 |
|
| Flop | Turn |
You can often check and raise again because any Ace out there is going to bet into you and you want to make any J or Q that is contemplating continuing their gutshot draw to be making a mathematical mistake. Be careful if you are re-raised in this spot (top two pair vs. a possible straight). Don't throw your hand away but call and then check and call on the river (unless YOU improve to kings or aces full in which case use your best judgment--usually bet out on the river unless you are SURE your opponent will bet).
Getting People Out vs. Getting Money In
The way you bet your hand on the turn (coupled with your position) will influence whether people with marginal hands will stay in or dump their hands. You should know whether you want to knock out the marginal hands or keep them in before you check or bet on the turn.
This influence is weaker in a typical loose low limit game. If you've ever driven a rental U-Haul truck you know the difference between steering one of them vs. steering a "normal" car. Low limit hold 'em is your U-Haul truck when it comes getting people out of the pot. Often the best you can do is influence the amount of money that goes into the pot, and most times you can't influence even that by more than a bet or two per player at the showdown.
Of course if you are going to fold then your play is much easier, but be considerate of the rest of the table don't muck your cards out of turn.
When you bet out on the turn your opponents will often react cautiously especially if the turn card is a "scare card"--usually one that allows for a straight, flush, or a card which pairs the board.
For example you're holding this hand under the gun.
  |
| Your Hole Cards |
and the flop is
  |
| Flop |
You check the flop and call a bet from a late position player. Five other people are in the pot with you.
The turn card is
|
 |
|
| Flop | Turn |
There are four ways to play this hand.
1. Check and Fold
2. Check and Call
3. Check and Raise
4. Bet
With this particular hand (nut flush draw plus one pair, with a kicker over the board with no straight on the board) #1 is out of the question with six players (including yourself) in the pot.
The second option (check and call) is viable, but should you make your flush on the river and bet out you may not get many callers. The advantage here is lower variance since you can easily dump your hand on the river if a club, ace, or five does not hit and if there are multiple callers.
If you check and raise in early position here you will cause weaker hands (8, 2 or 5 with weak kickers or gutshot straight draws) to fold their hands instead of calling two big bets. This is not advisable here because you may or may not have the best hand right now but chances are you do not. Anyone who calls your check raise here probably has you beat.
Betting the turn on this hand is probably the best choice because people will be cautious about re-raising you (unless they have a bigger hand than a pair of tens), on the other hand many low limit players will call your bet with as little as a gutshot straight draw. If you make a flush on the river and bet out again you stand a good chance of being raised by anyone else who made their flush as well (in addition to anyone who made their gutshot straight draw).
Another example, you hold the following in early position:
  |
| Your Hole Cards |
and the flop is:
  |
| Flop |
If you check and call, or bet the flop and the turn card is:
|
 |
|
| Flop | Turn |
In this case your opponents have a lot of potential draws (and potentially even a made straight with 8 9). You should attempt a check raise here because it is very likely that someone will attempt to bet at this pot if you have multiple callers, yet you stand a good chance that you have the best hand with top two pair. You need to make straight and flush draws pay as much money as possible to draw out on you.
(and here's hoping you get:
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|
 |
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| Flop | Turn | River |
on the river)