1.3.1 val vs. var, Byte, Short, Int, Long, Float, Double, Boolean, and Char. 1.3.2 String, Nullable variables.

1.4.1 ranges, types, values of function calls

1.5.1 create, modify, and access arrays 1.5.2 creating, modifying, and accessing lists

1.6.1 for and while loop. 1.6.2 break, continue and return

2.1.1 Properties, methods and basics of objects and classes in Kotlin 2.1.2 Named parameters, constructors.

2.2.1 Named parameters and Default values 2.2.2 Open and Abstract 2.2.3 Interface 2.2.4 Getters and Setters 2.2.5 visibility of properties, methods and class

3.1.1 Setup Play Project, The Constraint Layout 3.1.2 Constraints and Resizing, Positioning Widgets, Inner Lines within a Widget 3.1.3 Layouts on Different Devices, Layout Designer rendering error 3.1.4 Baseline Constraints

3.2.1 Events and setonclicklistener 3.2.2 Fixing Kotlin Gradle Issues 3.2.3 The Activity Lifecycle 3.2.4 The Logcat Pane 3.2.5 Logging the Activity Lifecycle 3.2.6 Saving and Restoring Instance State

4.3.1 Array of string, Array of Numbers, Array of Booleans, Array of objects, MultiDimensional Arrays 4.3.2 JSON comments

4.4.1 Intents and their applications, types of intents, 4.4.2 Data exchange from one activity to another using intent

4.5.1 Opening web URLs through app 4.5.2 Sharing media from our app to other apps

5.3.1 Create and insert data to the database 5.3.2 Read, Update and Delete data from database.