How many meals should I eat per day?

This really depends on you, your goals, and your schedule! You don't have to eat a certain amount of times per day, and what matters most is your total daily intake. 

However, most people do best with spacing out at least a few balanced meals per day. You can include more or less than that if you'd like, but generally (again, depending on goals), the more often you eat, the smaller the meals should be and vice versa.