Poker is kind of like rock, paper, scissors. At the beginning levels, you know the other person is probably going to throw rock on the first throw. So your best move is to throw paper (since scissors is thrown 30% of the time on average). This works well as a strategy against beginners.
If you're playing against a pro player, or something that is knowledgeable about the game, this is where being "several levels deep" will come to your advantage and this is the level that professional poker players will play in games. "Is he going to throw rock, or does he think I'm going to throw rock, or does that mean I should throw scissors, etc etc."
I think in beginner games, 3-betting on the turn is an easy fold, but you'll have to start second guessing yourself when playing in a higher-stakes game (as most people try to bluff you on the turn). This is why a lot of people lose a lot of money in high-stakes games. What worked in the lower stakes won't necessarily work in higher stake games, which is why you have to play in a comfortable bankroll. You'll make a lot of mistakes.