Yes. If the ball completely crosses the goal line, it's a goal.
It is the line on the ground between the goal posts. If the ball crosses it, a goal has been scored.
When the whole of the ball crosses the goal line, and (usually) ends up in the net.
A goal in soccer is scored when a player kicks the ball into the net. Here the entire ball must cross the goal line, , even if the goalkeeper both legs cross the line , the goal will not be given until the ball also crosses the line.
A technical goal in soccer is when the whole of the ball crossed the goal line and ends up in the net. Youtube has several videos showing the technique of a technical goal.
If the ball hits the line it's a FAIR BALL
There's a goal kick.
If the ball cross the line of the goal, it's a goal kick.
A goal kick is taken when the offense (players with the ball) kicks it past the line the goal is on. Therefore making it the defenders ball. A goal kick.
When the ball completely crosses the goal line using and body part other than hands/arms.
All of it. If any part of the ball is on or above any part of the touch line or goal line, even by a millimeter, then it is not out.
The goal rests on the goal line.