There are a few ways to screenshot on the Galaxy A20. The first way is to use the screenshot tool that comes with the phone. To do this, you need to open the camera app and then press and hold down the power button until you see a screen that says " screenshot." Then, release the button and take a screenshot of what you want to screenshot. The second way is to use the Volume Up/Down keys to move the image up or down on your screen. The third way is to use the Home key to take a screenshot of what you want to screenshot.