Kotlin is a statically-typed programming language that runs on the Java Virtual Machine and also can be compiled to JavaScript source code or uses the LLVM. Now Kotlin is official language of Android and I am sharing some of tutorials which help you to get started with this cool language.
Firstly you should know about why you should use Kotlin instead of Java
http://www.tellmehow.co/why-kotlin-better-than-java-for-android-development/
http://www.tellmehow.co/configure-android-studio-kotlin/
http://www.tellmehow.co/kotlin-syntax-null-safety-android-studio/
http://www.tellmehow.co/kotlin-rxjava-rxandroid/
http://www.tellmehow.co/kotlin-retrofit-with-reddit-api/
http://www.tellmehow.co/unit-test-kotlin-mockito-rxjava-spek/
http://www.tellmehow.co/kotlin-dagger-2-dependency-injection/
http://www.tellmehow.co/use-gson-with-kotlin/
http://www.tellmehow.co/android-jelly-toolbar-animation/
http://www.tellmehow.co/bubble-picker-android-library/
Hope it’ll help you to start developing in Kotlin. Keep it up!!!