A modern programming language that makes developers happier.

kotlinlang

Hi Sam, you can also take a look into below books:
1. <https://leanpub.com/coroutines>
2. <https://www.amazon.com/Programming-Android-Kotlin-Structured-Concurrency-dp-1492063002>
IMO, the first one approach by hand-on step by step to explain the concept, The second one will be good choice if you have Android background with detail explain about evolution from Thread to high level API specific in Android context

Thanks for the recommendation, just ordered the 2nd book