For iOS devices:

iPhone 13 and other models with Face ID:
1. Press the side button and the volume up button at the same time
2. Quickly release both buttons
3. Open Photos, then go to Albums > Media Types > Screenshots

iPhone models with Touch ID and side buttons:
1. Press the side button and the Home button at the same time
2. Quickly release both buttons
3. Open Photos, then go to Albums > Media Types > Screenshots

iPhone models with Touch ID and top buttons:
1. Press the top button and the Home button at the same time
2. Quickly release both buttons
3. Open Photos, then go to Albums > Media Types > Screenshot

For Android devices:
1. Press the Power and Volume Down buttons at the same time
2. Hold them for a couple of seconds and let go
3. Open your Photo Gallery where screenshots are saved automatically

For MacOS devices:
1. Press and hold these three keys together: Shift, Command, and 3
2. You will see a thumbnail in the corner of your screen: Click it to edit the screenshot, or wait for the screenshot to save it to your desktop

For Windows devices:
1. Press the Windows key + PrtScn
2. You can find the screenshot in Pictures > Screenshots