Kotlin is a tutorial that takes you step by step from basic syntax to the foundation you need for Android apps, backend services, data models, and collection processing. Kotlin code is shorter and more readable than Java, and thanks to features like null safety, data class, and lambda, it's become a favorite for modern development.
So you don't just skim the code on each lesson page without really absorbing it, we've included what the code does, what to watch out for, common mistakes, and real-world usage examples for each one. Click through the lesson list on the left, one at a time, to work through it.
Summary
By the end, you'll have a solid foundation in Kotlin syntax, control flow, null safety, collections, classes, inheritance, interfaces, lambdas, and you'll be able to write a mini project of your own.
What's Next
Start with "What is Kotlin?" first to see why Kotlin is worth using.