It is currently allowed. So... now.
1984
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.
Directly from a goal kick, corner kick, or throw-in.
No, you are not allowed to head butt another player in the chest
No it is not allowed.
Yes.
No. A player cannot be offside directly from a goal kick.
A bad aspect for a pro soccer player could be committing a foul inside the 18-yard box, or possibly scoring in your own goal on a corner kick.
No. Penalty kicks are not allowed in upward soccer, but they are allowed in bigger leagues.
It means that you can not score directly from the kick another player has to touch the ball for it he/she is able to score
corner kick
This answer would be more based on personal opinion. But some players who are well known for their skill at taking corners include: David Beckham Juan Roman Riquelme Mehmet Scholl Shunsuke Nakamura - Best corner kicked ever is Dejan 'Rambo' Petkovic without a doubt.