Two, Columbus never thought he'd made it to China. He called the people he encountered Indians because he thought he'd made it to the East Indies, what we now know as Indonesia. And three, Columbus was not a lucky idiot. He navigated completely unknown waters primarily by using a technique known as dead reckoning in which you figure out your position based on three pieces of information. The direction you're going, your speed, and the time which you figure out via hourglass. With only that technology to guide you, it's not actually that easy to hit a continent. Come here people who are saying he didn't hit a continent, he only hit some islands.