Which programming language and books on it to choose for creating applications on Android and Windows?

Question

Android

Questions of this kind have often appeared, but I will ask with some of my parameters.
I'm interested in choosing a programming language for creating games / applications for Android (this OS is a priority) and for Windows (for this OS, at first I will limit myself to simple applications / types of games, but in the future I would like to use this language to work with more serious graphics). Actually, is there a language that will cover these requirements?
I heard about C# with Xamarin and Java (but I'm not sure about the graphics, even though Minecraft is written in Java).
I tried to learn C ++ according to Stroustrup "The C ++ Programming Language. Special Edition", but it is very very difficult.
Therefore, I am also interested in a book on the language that you recommend, where everything would be well explained, for example, what does each word in each line, etc.
No programming experience whatsoever. Only scraps of information from various topics, but nothing serious. Therefore, the book is necessary "for beginners".
Please give proper answers. Thanks in advance.

Answer 1

For games, an engine like UE4 or Unity3D is better suited.
Applications will have to be written separately for each platform (since they are completely different).
You can of course use Xamarin. Separately for Desktop and Mobile there are Electron and NativeScript ReactNative respectively

Answer 2

under Android, java, and under windows c#