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GetComponent() is a Unity method from the MonoBehaviour class that is used to access data on other components. To fully understand how this method works, you have to wrap your head around a few different concepts.
Using helper method can help you to save time, for example if you need to get the factorial of an integer more than one time in your code, it's better for you to create a method and call it something like getFact(uint n), with a parameter an unsigned integer.