How to properly copy a list in Kotlin: cloning, copying, and deep copying

Hello everyone! I just started learning Kotlin and encountered an unexpected problem when working with lists. I have a list of numbers `originalList`, and I want to make a copy of it so that I can modify the copy without affecting the original. I tried simply assigning one list to another: ```kotlin fun main() { val originalList = mutableListOf(1, 2, 3, 4, 5) val copiedList = originalList copiedList.add(6) println("Original: $originalList") // [1, 2, 3, 4, 5, 6] — changed! println("Copied: $copiedList") // [1, 2, 3, 4, 5, 6] } ``` As you can see, when modifying `copiedList`, `originalList` also changes. This happens because the variable `copiedList` refers to the same object in memory, not to a new copy of the data. I know that in Java, for copying lists, I used