• A reference of frequently used operations in Kotlin and SQL. • The best code examples from books and online resources optimized for search. • Examples of design patterns for professional development. • Assistance in preparing for an exam or interview. • One app for iOS and macOS. • Quick search by topic code or name. • Offline access to all examples. • A short, offline, help system. In the application, some examples are available for an additional fee (approximately 45%). If you can help translate the application into your language, please contact me by email.