Question

Indicate your screen resolution and to describe the steps you used to do this .

Answer 1

On windows:
1. Right-click on an empty section of your Windows desktop.
2. Click the "Screen Resolution" option that appears in the list.
3. View the numbers shown next to the "Resolution:" heading on this screen. The first number is the number of horizontal pixels Windows is trying to display. The second number is the number of vertical pixels. If you see a "(Recommended)" label after this number, it is because Windows believes this screen resolution is the best one available to match your monitor or display.

mac: Click on Apple icon on left top.
About This Mac --> More Info... --> Display
You should see the resolution there.

iphone: http://www.whatismyscreenresolution.com/

android: same as iphone