This question does not contain enough information to give a factual answer because the angle and direction of the referee signal would need to be provided for a definite answer. This is speculation:
A goal kick is awarded when the ball crosses the goal line outside the bounds of the goal. The referee points to the goal area to signal a goal kick is to be the restart. No further signal is necessary.
You may be confusing a goal kick with an indirect free kick. On an indirect free kick the referee's arm is held straight up during the kick.
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To set the defensive line, nominate their man they are going to tackle or to set themselves as "pillars" or "guards". Pillars and guards are responsible for ensuring no one can sneak round the sides of the ruck (mainly the scrum half) to break through the defensive line.
It is simply a matter of superstition, some touch the grass, others touch the badge of the club above the exit in the tunnel, some cross themselves, some insist on coming out of the tunnel in a certain place (i.e. last). There is nothing more to it than that.
To signal an offside or foul to the refs assistant or ref himself.It is not anything written in stone,but a behavior that has developed over the years throughout soccer.
because when they call out they raise there hands to get the player with the balls attention
because it is a very tense moment and you may not know if he made it or not because they are sometimes closing there eyes hopes this helps