Layout sizes for mobile apps (ios/android)?

Question

Android

Good evening!
Please advise good articles (well, or if you want to explain yourself) that will help you figure out once and for all these issues:
1) how to choose the right size for the layout of android and ios mobile applications;
2) what is mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi;
3) Does the size of the layout differ if you draw it in Figma and Photoshop;

Answer 1

1. Read this and this
2. This and this
3. No