Pick a module. After each answer you get why the right choice is right and why the others are wrong. Exit module returns here.
Activity phases from creation to destruction, and what onCreate, onStart, onResume, onPause, onStop, and onDestroy are for.
val and var, data types, findViewById, explicit Intents, operators, if, and when.
The assessment items and the lifecycle and Kotlin reference from the quiz solutions PDF.