The free online course Developing Android Apps with Kotlin, was developed by Google with Udacity. You'll learn how to build Android apps using industry-standard tools and libraries in the Kotlin programming language.
In this free course, you will learn the fundamentals of building Android applications using Kotlin. The course covers architecture components, multi-screen navigation, data persistence, RESTful APIs and Material Design. By the end of the course, you’ll be able to create well-designed Android applications using Kotlin that can connect to the internet, store data and navigate between screens.
detail: Udacity FREE COURSE : Developing Android Apps with Kotlin by Google