https://support.apple.com/en-us/102616
Quickly save what's on your screen.
Press the side button and the volume up button at the same time.
Quickly release both buttons.
After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.
Press the side button and the Home button at the same time.
Quickly release both buttons.
After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.
Press the top button and the Home button at the same time.
Quickly release both buttons.
After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.
Open Photos, then go to Albums > Media Types > Screenshots.