Kotlin is a modern, expressive, and versatile language that has transformed the way developers build applications. Ultimate Kotlin Multiplatform for App Development takes you on a complete journey to mastering Kotlin Multiplatform, empowering you to create high-performance Android, iOS, and Web applications from a single shared codebase. You will begin by exploring the core foundations of Kotlin, syntax, structure, and key features, before advancing into topics such as object-oriented and functional programming, coroutines, and concurrency. From there, the book guides you through multiplatform architecture, project setup, Gradle configuration, and dependency management, giving you the skills to structure efficient, scalable cross-platform projects. Practical examples show you how to leverage essential libraries such as Ktor for networking, Koin for dependency injection, SQLDelight for database management, and Multiplatform Settings for shared configurations. Thus, by the end of this book, you will have the confidence and expertise to build, deploy, and optimize cross-platform applications — and become a truly modern Kotlin Multiplatform developer!