Static methods and variables in Kotlin: how to replace Java static?

Hello! I'm switching from Java to Kotlin and ran into a problem. In Java, I often used static methods and variables for utility classes, constants, or factory methods. For example, here's a simple class in Java: ```java public class MathUtils { public static final double PI = 3.14159; public static double square(double x) { return x * x; } } ``` I tried to write the same thing in Kotlin, but the compiler gives an error when trying to use the `static` keyword. I've read that Kotlin doesn't have `static` as such, but there are some "companion objects". I tried: ```kotlin class MathUtils { companion object { val PI = 3.14159 fun square(x: Double): Double = x * x } } ``` This works, but I'm confused by a few things