I like kotlin a lot, but suddenly there are a lot of articles in the front page about it. Kotlin isn't more cool because Google announced yesterday it is going to use it in Android. Kotlin is the same good language it was 2 days ago! (rant over)
If you want to learn kotlin go to the official docs and tutorial, they are as good as the language:
If you want to learn kotlin go to the official docs and tutorial, they are as good as the language:
http://kotlinlang.org/docs/reference/
And you don't need to install anything as you can try it in the browser:
https://try.kotlinlang.org