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Kotlin

The main language for Android. Concise, null-safe and easy to pick up after Python or Java.

About 20 hours of study.

Learning just this? See your route to it

Where to learn it

Read
Kotlin documentation

JetBrains

Getting started, then Basics and Concepts

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Practise
Exercism

Exercism

Kotlin track

Free practice tracks with mentoring, one per language.

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Wrong chapter, dead link, or know something better? Tell us on GitHub.

Which roles ask for it

Before and after