Reacting properly to moves made in a real money poker game is necessary, the reputation you formed for other players from the beginning also should be taken into consideration, the easy way out is always to "Fold", the important question is if the person who highers the bid has a winning hand or is only bluffing to make you fold, to answer this question you have to be rational and also use your gut feeling but also know percentages and statistics of cards, although it sucks to know you could of won when you ended up folding, it's better than putting lots of money and losing all of it.
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All In is also a great strategy to attempt, unless you are desperate try to use it when you do have at least something - even if it isn't considered a strong hand, if you won priory with nothing and scared people of into folding maybe you shouldn't use the "All In" again, if you do use the move - make sure you do it with confidence or else other players will smell a bluff and the whole move will fire-back at you.
There are other moves you can try at the poker table, before jumping in with an 'all in' move. When you do so, you are giving yourself a chance to wipe out the competition, but you can also find yourself easily out of the game. In any cash game at the casino, you should operate with caution, as your goal is to extend your stay at the table, and be the last one seated, and 'counting your money in the stairs'..