What's the difference between a key and a property, if they both equal "value"?

if you learn any other languages, like JAVA for example, it will make wayyy more sense and be very intuitive (probably why programmers usually reiterate that when you learn other languages, the subsequent are much easier and you can have "eureka" moments).

The way you do it in Java is

/* public class called Students , with instance variables of String, int, and float */
public class Students  {
String name;
int age;
float grades;

/* constructor to initialize the instance variables to values, i.e. making the age equal to 17 etc.. */
public Students () {
name = "John";
age = 17;
grades = 99.9f;
 }

}

you can see how analogous it is to Javascript, the key is just like name and the property is the actual value, in this case "John". Anyway, hope that didn't confuse ya and it's probably not the best example. I actually like the way OOP (object orientated) is done in Java, but maybe because its a more a pure OOP language or maybe I'm just biased that was one of my first languages.

they're related, see this:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects