Reddit mentions of Kotlin in Action

First, welcome to the indie community! I'd recommend to start designing a small PoC. Grab some sheets of paper and start drawing your app's different views and interactions. The purpose of this is to clarify your ideas. At the beginning, that's all you need. Once you have something you think is "usable", then, just then, move to coding - it'll save you a lot of time. Just as a reference, I spent 7 months designing Memorigi 1.0 (no coding, just drawings).

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How much programming you need? Well, there's no "right amount" IMO. If you want to go Java path, I recommend this book Android Programming: The Big Nerd Ranch Guide (https://www.amazon.com/Android-Programming-Ranch-Guide-Guides/dp/0134706056/ref=sr_1_2?ie=UTF8&qid=1551068980&sr=8-2). If however, you take Kotlin path this is my recommendation Kotlin in Action (https://www.amazon.com/Kotlin-Action-Dmitry-Jemerov/dp/1617293296).

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One last advice, start small, then grow from there. Don't try to have your app fully complete in one pass. It's a recipe for discouragement and disaster. DM me if at some point you feel stuck and I'll do my best to help you.

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Cheers!

I recommand Kotlin in action : https://www.amazon.com/Kotlin-Action-Dmitry-Jemerov/dp/1617293296/ref=sr_1_2?ie=UTF8&qid=1543497633&sr=8-2&keywords=kotlin+in+action

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Se intendi quale materiale ho seguito:

• Documentazione ufficiale, molto chiara;
  
• Kotlin in Action, libro introduttivo ben fatto.

If you're looking for books, I'd recommend Kotlin in Action. It's by a couple of core developers for Kotlin. The book is relatively short, it's pretty practical but not platform specific like it's not only for android.