How to run a kotlin file and which is the best ide for kotlin

Answer 1

Did you mean 'running on android' or on desktop

And for the question BEST ide , most of text editor and ide partially support kotlin with 3rd party plugins(unofficial) that doesn't support build system like visual studio code which doesn't full fill the criteria to be BEST for kotlin so I recommend u IntelliJ IDEA with full support

Answer 2

Intellij IDEA