Sessions cover these topics in brief - What is Kotlin ,Features ,Variables and Data types,  Operators , Conditional operators (if, else, when), Range, Loop, Function, Default Arguments, Array, Classes and Objects, Constructors, Getter and Setter, Inheritance, Polymorphism, Abstract, Interface, Type checking and smart casting, Visibility Modifier ,Object Declaration, Object Expression, Null Safety, Exception Handling, Collection Array (fixed), Companion Object, Data Class, Enum, Asynchronous Programming. And building a basic app.