Kotlin
A modern, concise, null-safe language from JetBrains that runs on the JVM — the recommended language for Android apps, and widely used for back-end services, with Kotlin Multiplatform sharing code across Android, iOS, desktop, and web.
- Difficulty
- Beginner
- Version
- 2.2
- Website
- Visit site
- Docs
- Read docs
What you'll learn
A complete path from the basics to production-ready skills — work through it in order, at your own pace.
- 1 Level 1 — Beginner 35 lessons
- 2 Beginner Projects 1 lesson
- 3 Level 2 — Intermediate 24 lessons
- 4 Intermediate Projects 1 lesson
- 5 Level 3 — Advanced 17 lessons
- 6 Advanced Projects 1 lesson
- 7 What You Should Know Now — and What's Next 1 lesson
Ready to start learning Kotlin?
No prior programming experience required — every lesson starts from the basics.
Related developer tools
Practice what you learn with these free tools.
JSON Formatter
Pretty-print and indent minified or messy JSON.
JSON Validator
Check whether a JSON document is syntactically valid.
Regex Tester
Test a regular expression against a block of text and see every match.
Code Beautifier
Auto-indent minified HTML, CSS, or JavaScript.
Code Difference Comparison Tool
Compare two blocks of text or code line by line.
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