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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.

Where to learn it

Read
Kotlin documentation

JetBrains

Getting started, then Basics and Concepts

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Watch

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Practise
Exercism

Exercism

Kotlin track

Free practice tracks with mentoring, one per language.

Section not checked yet

Which roles ask for it

Before and after