Useful links

Documentation

• Kotlin documentation — official language documentation with examples and an API reference
• Kotlin Standard Library API reference — a reference for Kotlin standard library classes and functions
• Kotlin coding conventions — official naming, formatting, and idiomatic coding style rules
• Collections overview — lists, sets, maps, and collection operations
• Coroutines guide — a guide to coroutines, scopes, context, and cancellation
• Asynchronous Flow — asynchronous Flow data streams, operators, and exception handling
• Kotlin serialization — serializing objects to JSON with kotlinx.serialization
• Test code using JUnit in JVM — configuring and writing unit tests with kotlin.test and JUnit

Tutorials and practice

• Kotlin tour — a step-by-step introduction to language fundamentals with interactive exercises
• Kotlin Koans — a series of short exercises for practicing syntax directly in the browser
• Kotlin Playground — an online editor for running and sharing Kotlin code without installation
• Baeldung Kotlin tutorials — practical articles about the language, coroutines, testing, and libraries

Tools and libraries

• IntelliJ IDEA documentation — documentation for the development environment, debugger, and refactoring tools
• Gradle User Manual — project builds, dependencies, and Kotlin DSL scripts
• Git Reference Manual — a command reference for the Git version control system
• Exposed documentation — relational database access through DSL and DAO
• Compose Multiplatform — creating declarative graphical interfaces for desktop applications
• Navigation in Compose Multiplatform — navigating between application screens in Compose Multiplatform

Community, blogs, and videos

• The Kotlin Blog — official news about language, tool, and library releases
• Kotlin by JetBrains on YouTube — video tutorials, KotlinConf talks, and overviews of new features