Detecting & using tells can add to your profits.
Just as you could learn about your poker opponents by observing how they would play their hands, much could also be deduced by watching their actions and body language. Many of your rivals will be 
apt to send out the same ‘signals’ repeatedly, which you could use to infer the strength of their hand.
These signals have commonly been called tells in poker terminology. Careful observation of your opponents could identify valuable tells, which would make or save you a considerable amount of money over time.
Your many poker opponents will display a wide assortment of tells. There would be, however, a few common ones to be on the lookout for. Once you will be habituated to spotting these tells, you will also become more adroit at finding others. Following are some typical tells and their likely meanings.
Folding Out of Turn
If you would look to your left before you would act, you would often observe some of your poker opponents preparing to fold their hands. They might not literally fold out of turn, but one glance at them would alert you that they were not going to play. This tell would be helpful because it would actually alter your position.
For instance, one reason why you would have to pass some decent hands from middle position would be that you wouldn’t know yet what your poker opponents behind you were going to do. However, if it were to be evident that they were going to fold, you will have just ‘inherited’ the button. So, you could now play hands fitting to that position.
Placing Chips on Their Cards
When a poker opponent would place a chip on his cards, it would typically mean that he was going to play his hand. If you were to look to your left hand you should observe this, it might help you avoid getting involved with a weaker hand.
You should be careful deciphering this tell, however. Some poker players will always place a chip on their cards before the action would have reached them. Your job would be to determine which poker players were doing this only when they were going to play.
Picking Up Chips out of Turn
Some poker players would like to have their chips ready for action when it would be their turn. They would count out the amount of the bet, or even the size of a raise. Again, by looking to your left, you might be able to correctly guess what each of your opponents would be going to do.
This could help you avoid making trivial calls, particularly if you were to see that the pot was going to be raised behind you. You should be aware of the reverse of this tell. Some poker players will routinely pick up chips when they intend to fold for any bet, perhaps in an endeavor to discourage those bets.
Talking About Their Hands
Some poker players would like to talk about their hands, or offer friendly counsel to their opponents in the midst of a pot. What you would want to know would be, were they speaking the truth? Should you believe them?
In most cases, talkers will follow a steady pattern. Some poker players will consistently lie, while others will tell the truth in an endeavor at reverse psychology. Learning to detect who will fall into which category will make you some money.
Academy Award Performances
There would be a good reason why most poker players wouldn’t get major roles in Hollywood. If you wouldn’t know what that was, watch that is, watch them as they will try to dissuade you to call, fold, raise, or whatever it would be that they would want you to do. Some poker players would act strong when they are weak, reaching for their chips, as they would see you preparing to bet.
Others will appear disinterested in the pot until the action would get to them, at which time they would ease in a half-hearted raise (while holding the nuts). By surveying the table when you would not be implicated in a hand, you would learn to spot the actors. Then, when you would play a pot with them, you would be able to interpret their acts.
When to Look for Tells
The best time to learn to spot and use tells would not be when you would in fact be involved in a hand. Rather, this would be one more part of your poker education that could be improved when you would have folded and would be waiting for the next hand to start.
The vast majority of your opponents would use this time to chat, watch television, or schmooze with the cocktail waitresses. If you were to use this time wisely, you would be miles ahead of the other poker players, even if it were to cost you a date or two with a waitress.
When to bluff in limit holdem?
Although it might seem that profitably bluffing in low limit holdem poker would be a next-to-impossible 
endeavor, you could take advantage of some occasions. Here are some dos and don’ts to guide you, as you would prepare to steal:
Do's
You should bluff against two rivals or fewer. Often in situations against only one or two poker players, neither of your rivals would have much of a hand. Often both would have been on draws that would never materialize.
As your hand-reading skills will develop, you would learn when bluffs would have the greatest chance of success, and you could limit your attempts to those times.
You should bluff when seven cards hit. We have discussed this in Tip thirty-eight, but it would be worth repeating. A bluff would have a much better chance of success if your poker rivals could fold assertively. Bluffing when a random card were to come often would lead to calls out of curiosity as much as any other reason.
However, when the fourth card of a suit was to appear, or the fourth successive card to a straight, or possibly when the board double-pairs, it would seem pretty obvious what you were holding if you were to bet. Now, your poker rivals could fold, certain not only that they were beat, but also of how it were to happened.
You should bluff when an aggressive poker player were to show weakness. Aggressive poker players will be likely to bet when they have anything at all (and sometimes when they don’t). So, if they were to check, it would often mean that they would have given up on the hand. Although they could be checking something like middle pair (which they would call you with), it would probably be worth a shot to bluff in this spot, as you would know they couldn’t have too much.
Dont's
You shouldn’t endeavor to steal multiway pots. Someone would nearly always call a bet when five or more poker players were in the hand. Your rivals would often comprehend that a stronger hand would be needed to win in this position; as a result, they could choose to check and would call with all but their best hands.
You shouldn’t bluff behind a passive poker player’s check. Passive poker players would check hands that aggressive poker players would habitually bet for value. So, you shouldn’t make the mistake of deducing a passive poker player’s check as a sign of weakness.
Rather, it would just be a sign that he would not be holding the nuts. It positively wouldn’t mean you wouldn’t get called, though, so you should save your bluff for a better time.
You shouldn’t bluff when chronic calling stations are in the pot. These poker players will frequently call with next to nothing. If you were to be the one holding nothing, then a calling station’s hand would win. You would be throwing away money if you would try to bluff these guys.