Where to start and where to look for a mobile igrostroy?

Question

Android

I am slowly moving to mobile developing. A very interesting direction in the creation of games.
Please advise a couple of good books on the topic "Game Programming for iOS & Android".
I would like the books to cover many aspects, from engines to the development of a 3D model and its integration into the game.
I also want to know about cross-platform solutions so that I don't have to rewrite the game from scratch for other platforms.
Thank you.

Answer 1

If 3D, then it's Unity. Like, cross-platform. Only paid.

Answer 2

I would first of all look at cocos2d, and unity. They have good documentation.
Then you will already have enough experience to choose the right areas for your development yourself.