Soccer Goalkeeper's punt and scores is the goal valid?

Answer 1

Yes, a goalkeeper can score that way. It's unusual, but there are a whole bunch of examples available on video where just that thing has happened. Many times it involves an error on the part of the defending keeper, but it happens. I recall seeing one where there was a lot of wind behind a keeper who kicked a ball upfield. The kick was a good one, and the wind carried it well across the half line. The defending keeper misjudged how far the ball would bounce, however, and came out too far in an attempt to take control of the ball. It bounced over his head and into the net. Goal!