Kotlin Apprentice
Irina Galata, Joe Howard, Ellen Shapiro (2021)

This is a book for complete beginners to the new, modern Kotlin language.
Everything in the book takes place in a clean, modern development environment, which means you can focus on the core features of programming in the Kotlin language, without getting bogged down in the many details of building apps. This is a sister book to the Android Apprentice the Android Apprentice focuses on making apps for Android, while the Kotlin Apprentice focuses on the Kotlin language fundamentals.