Kotlin References and Official Docs

Official Documentation (Bookmark These)

• Kotlin Docs: kotlinlang.org/docs/home.html - the complete language reference.
• Playground: play.kotlinlang.org - run every lesson here with zero install.
• Kotlin Koans: play.kotlinlang.org/koans - 40+ interactive exercises.
• API Reference: kotlinlang.org/api - every stdlib function documented.

Coroutines and Advanced

• Coroutines Guide: kotlinlang.org/docs/coroutines-guide.
• KEEP Proposals: github.com/Kotlin/KEEP - where the language evolves.
• Spring + Kotlin: docs.spring.io - Kotlin support.
• Android Basics: developer.android.com/kotlin.

Our Code and Tutorials

• Examples repo: github.com/harry44/kotlin-examples - runnable code for every lesson.
• GroovyGrails Kotlin track: groovygrails.in/tutorial/kotlin-tutorial.

Key Points

• Docs plus playground plus koans is the fastest loop.
• Read KEEP to understand why features exist.
• Clone the examples repo and run each file as you read.