1. What is Kotlin?

2. What are the main features of Kotlin?

3. How to declare a variable in Kotlin?

4. What is a data class in Kotlin?

5. How to handle null safety in Kotlin?

6. What are extension functions in Kotlin?

7. How to create a function in Kotlin?

8. What are higher-order functions in Kotlin?

9. What are coroutines in Kotlin?

10. How to use collections in Kotlin?

11. What is the purpose of `lateinit` in Kotlin?

12. How to create an interface in Kotlin?

13. What is a companion object in Kotlin?

14. How to handle exceptions in Kotlin?

15. What is the difference between `==` and `===` in Kotlin?

16. How to create a sealed class in Kotlin?

17. How to use when expression in Kotlin?

18. How to implement inheritance in Kotlin?

19. What are inline functions in Kotlin?

20. How to use the `by` keyword for delegation in Kotlin?

21. How to create a lambda expression in Kotlin?

22. What is the use of `object` keyword in Kotlin?

23. How to use the `override` keyword in Kotlin?

24. How to define a primary constructor in Kotlin?

25. How to create a secondary constructor in Kotlin?

26. How to work with JSON in Kotlin?

27. How to use the `require` function in Kotlin?

28. What is the use of `lazy` in Kotlin?

29. How to implement generics in Kotlin?

30. What is the purpose of `this` keyword in Kotlin?

31. How to use the `as` keyword in Kotlin?

32. What is typealias in Kotlin?

33. How to use the `in` operator in Kotlin?

34. What are annotations in Kotlin?

35. How to create a custom exception in Kotlin?

36. How to use the `suspend` keyword in Kotlin?

37. What is the use of `@JvmStatic` annotation in Kotlin?

38. How to use the `@Deprecated` annotation in Kotlin?

39. What is `sealed` interface in Kotlin?

40. How to implement a generic function in Kotlin?

41. How to handle multiple exceptions in Kotlin?