Getting Started With Kotlin - DZone RefCardz
I wrote a RefCard for DZone called Getting Started With Kotlin. It's basically a quick reference guide covering some of the most important part of the language. You can find this card on this blog, too.
Using Kotlin with Ktor to create Web Apps - DZone Web Development Guide
Null-Safe Programming: The Kotlin Way - DZone Java Guide 2018
I wrote an article about Kotlin nullability features compared to Java's means of null safe programming. It's been published in the DZone Java Guide.