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Modern JVM language. Concise, null-safe, batteries included. On Libre Academy you learn Kotlin for free by writing real code in an in-editor workbench, graded by hidden tests (desktop app (native toolchain)). No paywall, no sign-up.
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Kotlin courses
- Kotlin Challenges · Kotlin · 120 lessons
- Exercism Kotlin Track · Kotlin · 88 lessons
- Kotlin Koans · Kotlin · 43 lessons
Helpful reading
Why passive video doesn't make you a programmer · Bring Your Own Book: turning any PDF into a course