How to prepare graphics for mobile platforms in Unity3D?

Question

Android

Gentlemen, I rummaged through the entire Internet - I did not find a clear and coherent guide. How to prepare graphics for a mobile game on Unity (primarily interested in android), how to change it depending on the screen resolution of the device, etc. I'm not asking you to write me explanations right here - at least give links where you can read about it, otherwise I've already broken my head - I have zero experience in developing for mobile phones.

Answer 1

I can tell only for Corona SDK - spiralcodestudio.com/corona-sdk-pro-tip-of-the-day-36
Perhaps the principle is the same.