One of the main reasons why some people can't get the success they want at the lower stakes is because they make big pre-flop mistakes that cost them dearly on the flop, turn and river.In fact, in today's games, one of the easiest ways to spot weaker players is to look for people who are limping into the pot. If this is still a problem for you, then I would suggest that you eradicate it from your game as quickly as possible.Position plays a key role in poker. It's also a proven fact that you'll win a lot more money when you're near the button than anywhere else.Stick to a relatively tight style when playing in the blinds, especially if you are just a beginner.If you're on the button or the cut-off, it's time to start playing all those weak aces, weak kings, suited connectors, suited half-connectors with one missing card in sequence, and so on.Another big preflop mistake that can cost you dearly is over-calling 3-bets out of position. There may be times when you raise and get 3-bet. Many low stakes players make the mistake of calling a lot in these situations.