Overview
Core Concepts
Classes and Objects
Functions & Lambdas
Collections
File Handling
Persisting data
Annotations
Libraries & Plugins
Unit Testing
Kotlin with Spring
Kotlin and Java
Other
If you have a few years of experience in the Java ecosystem, and you're interested in sharing that experience with the community (and getting paid for your work of course), have a look at the "Write for Us" page. Cheers, Eugen