Master Kotlin variables, null safety operators, type system, control flow, and smart casts.

Write expressive Kotlin with extension functions, lambdas, higher-order functions, and scope functions.

Model your domain with data classes, sealed hierarchies, enums, objects, and Kotlin's inheritance model.

Harness Kotlin collections with map/filter/fold, lazy Sequences, groupBy, zip, and functional chaining.

Master coroutines, Flow, structured concurrency, and the basics of Jetpack Compose and ViewModel.