From my experience going with gradle and checking Kotlin is always the best option

Kotlin/JVM?

hm, I think you have an older IntelliJ IDEA, because mine looks like this now http://snpy.in/rEywCO

Kotlin JVM i'd suppose

haha

I have no idea what gradle I'm using tbh 😄

oh

if you want to use gradle with the KotlinDSL you need 5.x.

tbh the groovy dsl, at least in my opinion, is a little less verbose and more usable, but if you want the kotlin dsl, I suggest finding out your version