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5) Not calling so many raises preflop
Other bad habit, if I saw a hand I would play in limped pot I would get married to it and play it as well facing a raise. That's why I never watch my cards before my turn in live games
I used to say myself, you have the implied odds just call, in reality I very rarely have the implied odds in headsup pots with hand like 75s.
Other thing is if I open raises utg for 4BB with AJo or so someone raised from next position to 16BB I would call, because for gods sake I can't fold preflop after my own raise!
Now this might not have been so big mistake preflop, but when you are out of position and not playing perfectly postflop you easilly have negative implied odds( I hope that's the correct term)

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Don't be afraid to call a raise in position. I love calling raises in position with a variety of hands, particularly against weak players. I don't mean hands like AJ, I mean hands like 67s or AK. Actually playing poker is fun.