How to find out the names of properties and methods?

Question

OOP

Hey!
I am new to programming. I always have one question that I can't figure out. Below is an example code in Java.

public class Main
{
  public static void main(String[] args) {
    System.out.println("Привет");
  }
}

Question: how do I know when writing code that instead of "out", for example, should not be "output"? Where does such information come from?
Thank you!

Answer 1

You call a method of the System class.
Therefore, you study the standard libraries, find out what methods System has and why it is needed.
In modern programming without knowledge of standard methods - nowhere. Or did you think only for/if needs to be taught?