There are several editors that support Kotlin—Micro, Vim, NeoVim, Atom, and VS Code.

My go-to-use editor is Micro, (https://micro-editor.github.io/index.html). It is a fast and easy-to-use editor (sort of an over-powered Nano):

In your favourite editor, create a file named hello.kt and type the following code:

fun main(args: Array<String>) {
    println("Hello, World!")
}

Now in your console, compile your program with this:

$ kotlinc hello.kt

To execute it, type this in your console:

$ kotlin HelloKt