Documentation Kotlin documentation is a good place to start, check out these links to get your feet wet: Basics

Idioms

Classes

Functions

Community Kotlin community is open, helpful, and welcoming. Don't hesitate to join and ask on any platform you like: Blog

Forum

Slack

Stack overflow

Playground Hands-on experience is the way to master your Kotlin skills on real examples right in the browser: Playground

Hands-on Labs

Kotlin by Example

Koans

Certified Training "Certified by JetBrains" is a program created to work with training providers to verify their existing Kotlin training programs, and at the same time build a trusted network of global partners: Training Partners