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Best resources to learnKotlin

Study sheet

Kotlin is a concise JVM language and the primary language for Android. You will learn null safety, coroutines, data classes and functional idioms, and how Kotlin interoperates with Java.

8 resources · · How we curate

🎓Courses(3)

course

Android Basics with Compose

Google's free eight-unit Android curriculum taught entirely in Kotlin. The first three units teach language fundamentals - classes, collections, lambdas, data classes - before layering on Compose UI, ViewModels, navigation, coroutines with Retrofit, and Room persistence.

beginner🇬🇧
course

Kotlin Koans

Designed specifically for Java developers crossing over. A graded series of failing unit tests you fix to internalize Kotlin idioms: nullable types, lambdas, collection operations, extension functions, delegated properties and builders. Playable free in the browser or inside IntelliJ IDEA via the JetBrains Academy plugin.

intermediate🇬🇧
course

Advanced Programming in Kotlin

Meta's Coursera course on Kotlin features beyond the basics: object and companion declarations, extension functions, lambdas, higher-order functions, and collection operations like map and fold, ending in a restaurant menu app built with them.

intermediate🇬🇧

📚Books(2)

bookPaid

Kotlin in Action, Second Edition

The structural anchor for this topic. Uniquely explains why the language is shaped as it is - how nullable types compile, why inline functions exist, what the JVM does underneath - which no tutorial or doc page attempts. Four Kotlin team members, including coroutines designer Roman Elizarov, cover types and null safety, higher-order functions, data classes, generics, reflection, DSL construction and Java interoperability, plus new chapters on coroutines, flows and structured concurrency.

intermediate🇬🇧
bookPaid

Atomic Kotlin

Bruce Eckel and Kotlin team member Svetlana Isakova break the language into small self-contained atoms, each followed by exercises solvable inside IntelliJ IDEA. Assumes no prior programming experience and builds steadily to lambdas, generics and functional idioms.

beginner🇬🇧

🌐Websites(3)

website

Coroutines and Flow - Official Kotlin Guide

The kotlinx.coroutines reference guide: suspending functions, structured concurrency, cancellation and timeouts, dispatchers and coroutine context, exception handling, channels, shared mutable state, and Flow. Written by the library team, with runnable examples attached to every concept.

advanced🇬🇧
website

Kotlin Tour (Official Interactive Tour)

The canonical zero-friction entry point. JetBrains' interactive browser tour of Kotlin, running from hello world through null safety, classes and collections into an intermediate track on extension functions, scope functions and generics. Every snippet is editable and executable, no install needed.

beginner🇬🇧
website

Kotlin Programming Language (Official Site)

The official Kotlin website maintained by JetBrains, with the language reference, getting-started guides, tutorials, the standard library API docs and an online playground for JVM, Android and multiplatform development. Learners can go from installation to idiomatic Kotlin using primary documentation.

beginner🇬🇧
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Frequently Asked Questions

What are the best free resources to learn Kotlin?

Dantes has curated 8 resources for Kotlin, including 2 books, 3 courses, 3 websites. All resources are hand-picked for quality — no algorithmic filler. Browse the full list above to find the format that works best for you.

Is Kotlin hard to learn?

Kotlin is approachable at the beginner level — there are resources here specifically for those starting from scratch. As you progress, intermediate and advanced material is also available to take your skills further.

What types of Kotlin learning resources are available on Dantes?

For Kotlin, Dantes has curated 2 books, 3 courses, 3 websites. Each resource type serves a different learning style: videos and YouTube for visual learners, books for depth, courses for structured progression, and websites for quick reference.

How does Dantes select Kotlin resources?

Dantes is an algorithm-free learning directory. Resources are hand-curated based on quality, accuracy, and usefulness — not engagement metrics or paid placements. The goal is to surface the best learning material for Kotlin, whether it's a free YouTube series, a classic textbook, or an open courseware from a top university.

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