I can't find a video explaining what the red and green buttons do for a flash card. Does green mean.. I'm done with this now., Don't show me again. Or does it mean ... Yes - show me again. Also the same for the 1,2,3,4,again or does it meanOr does it need

I can’t find a video explaining what the red and green buttons do for a flash card. Does green mean… I’m done with this now., Don’t show me again. Or does it mean … Yes - show me again. Also the same for the 1,2,3,4,again or does it meanOr does it need