How do people know how to use magic?

Ever noticed how every time magic occurs, people automatically know how to use it? In Harry Potter, nobody had to teach Harry how to cast spells because he knew how to do it before he was looked after by the Dursleys. In fairy tales, the magic beans grow into a magical beanstalk, and people know how to climb them. In fantasy movies, magic is the key to finding the magic crystal, and it’s impossible to make a mistake with magic. Not only that, but in many cases of magic, people seem to know exactly how to use it beforehand, without any instruction. Not to mention that people can use magic effectively right off the bat. So, how do people know how to use magic?<br><br>If we go by the logic of "practice makes perfect", we wouldn't be able to use magic the first time we use it, since we would have never practiced it before. Maybe magic is like riding a bike, where you don't need to practice anymore after you've learned it, but then again, it's pretty hard to ride a bike if you've never done it before.<br><br>Or maybe it's the other way around - maybe we all know how to use magic, but we have to figure out what triggers it. It's hard to say because we've never been able to see magic happen outside of fiction, so we can't say for sure. But what we do know is that, in the case of magic, practice doesn't necessarily make perfect.<br><br>So, how do people know how to use magic? Is it something that comes naturally to us, like walking or talking, or is it something that we have to practice in order to master? Maybe magic is a sort of instinct that we're all born with, but then again, why would we need magic to begin with? Maybe that's the main reason we invent magic in the first place: to live in a world where we can simply do anything we want with a flick of our wand or point of a finger.