Kotlin Programming,

Not sure if this is the right fit?

Consider Kotlin in Action by Dmitry Jemerov.

“Practical and example-driven, this is a hands-on introduction to Kotlin that emphasizes readable code, safety features, and how to make Kotlin interoperate with existing Java projects. Chapters pair short explanations with runnable samples, notes about IDEs and build tools, and concrete advice for calling Java from Kotlin. What works best is teaching usable Kotlin patterns you can drop into a JVM codebase; the main limitation is a steady Java orientation and tooling detail that will feel dense if you wanted a lightweight, purely idiomatic language tour.”