after you get a little experience too, implied odds let you fudge a little. calling a halfpot bet with a straight draw might not be correct, but you're often going to make up for it on the next hand.

so just remember, outs x 2 = % to hit an out per card to come, and then think, well this bet is probably good/bad/ugly for me to call given my outs, and the odds of me getting paid off if i hit are good/bad/ugly, so i should do x.