To score a direct goal from a corner kick is very very rare, but it can be headed more easily.
Yes. A player may score directly from a kickoff, goal kick, corner kick, direct free kick, or dropped ball. A player may not score directly from an indirect free kick or throw-in.
No you cant.
Only if the kick awarded was a direct free kick.
A goal may be scored directly from a corner kick.
1984
It is neither direct nor indirect. That said, a goal cannot be scored directly from a throw-in. The restart would be the same as if the score was directly from an indirect free kick. If the ball enters the opponent's goal then it's a goal kick for the opponents. If the ball enters the thrower's goal, then it's a corner kick for the opponents.
Yes a goalkeeper can kick the ball and score more then one goal into the other net. And he can score from corner kicks as well.
Yes. You can score from anywhere on the field at any time except from a throw-in or an indirect free kick. Also, you cannot score an own-goal directly from a kick-off, goal kick, corner kick, free kick, or penalty kick.
No goal is scored and the restart is a corner kick for the opposing team.
clearance
It is currently allowed. So... now.