Head first Kotlin: a brain-friendly guide

Getting started: a quick dip

Basic types and variables: being a variable

Functions: getting out of main

Classes and objects: a bit of class

Subclasses and superclasses: using your inheritance

Abstract classes and interfaces: serious polymorphism

Data classes: dealing with data

Nulls and exceptions: safe and sound

Collections: get organized

Generics: know your ins from your outs

Lambdas and higher-order functions: treating code like data

Built-in higher-order functions: power up your code

Coroutines: running code in parallel

Testing: hold your code to account

Leftovers: the top ten things (we didn't cover).