Easiest way to win is to play, you can't win if you don't play
For a serious answer: play the games with the most odds in you favour. You'll still lose (because the player always loses), but if you only play with the free money you get from the various sites that offer faucets (or whatever they personally call it), you'll never technically lose anything
you have personally put forward.
But do you have the power to 'know when to fold them'? That's real the question here.
Dice games are easy: bet half your balance and set it to the highest percent chance you can (what's that, like 94%?). The amount you win is just fractions of what you bet, but the odds are extremely high, and it'll build up your balance-- just don't use all your winnings to bet, save half of it!
Strategically play the game...