W10, also use the snipping tool
Android, IOS will have a screen capture function specific to the phone, but usually something like press -briefly- power and volumeup buttons same time.
10 years ago I was selling a Hobi sail boat on CL. A few days later there was my ad with a few things changed, but my boat in some MOFO's scammed ad. Didn't go anywhere but F.F.S.