I don't know C#, but I just spent 2 weeks working through a Kotlin textbook cover to cover, and then started rewriting my Java Android app in it. So, I'll list off some things I've enjoyed about it.

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Every file I've rewritten in Kotlin has reduced in line count from around 30%-50% compared to Java. And I'm probably not writing super idiomatic code yet (especially while reading the equivalent Java simultaneously and translating it over)
val & var: vals are immutable, great for thread safety. Quickly you realize that most of your variables in general don't have be reinitialized.
null safety: you have to opt into types being nullable with the ? operator, var person: Person vs var person: Person? - the first can't be null but the second can. Gives the compiler a lot of knowledge to enforce null safety in your app this way. The safe call (?.) and elvis (?:) operators build on this.
Opt-in inheritance instead of opt-out. Classes need to be marked "open" for you to be allowed to inherit from them. Makes it so you can enforce a composition over inheritance style architecture.
Extension functions: since you can't inherit, you still sometimes need to add functionality to a class for some purpose. Extension functions can be attached to the class definition, but private to a module (or added to a utility Extensions file that you can opt-into importing). So you can add behavior, but don't have to pollute the ecosystem outside of your module if your extensions aren't valuable in general usage.
Not everything has to be part of a class. You can have free-standing functions
The scoping functions are really nice (let, run, also, with, apply)
when statements are really nice
It's a multi-paradigm language, so you can take the best parts you enjoy from both OOP and functional development styles

u/S0phon · 9 points r/Kotlin

I like Kotlin Programming by Big Nerd Ranch though I cannot compare it to other books. But Big Nerd Ranch are reputable.

Effective Kotlin is probably for the more advanced but the book wasn't/isn't well received by this community so you will have to do your research on if it's for you.

u/maynotbe · -1 points r/androiddev

https://www.amazon.com/Kotlin-Programming-Nerd-Ranch-Guide/dp/0135161630/ref=nodl_

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