Press the Power button and Volume Down button at the same time
Release both buttons quickly
Use the Palm swipe gesture by swiping the edge of your hand across the screen
Enable Palm swipe in Settings > Advanced features > Motions and gestures
Use the S Pen Air Command and select Screen write, if your Samsung has an S Pen
Use the Quick Settings panel and tap Screenshot, if available
Use Bixby or Google Assistant and say “Take a screenshot”