Design features of mobile applications. What to read?

Question

Design

Good afternoon, in fact, I have been working on the web all the time, I want to retrain in mobile, what can I read on this topic? I heard about some android pitfalls, I think there are many features that the original guidelines do not show.
And in general, it’s boring to read the guidelines, it’s more pleasant to read from the author, who, in addition to everything else, also shares his experience)
Thank you

Answer 1

Guidelines online.
Google writes quite high-quality guidelines that you don’t understand / don’t like there?

Answer 2

If you're writing for iOS, then first of all iOS Human Interface Guidelines