What is the cause for a Direct Kick?

Answer 1

There are seven offenses that result in a direct free kick if done in a manner the referee believes was careless, reckless, or using excessive force:

kicking or attempting to kick an opponent

tripping or attempting to trip an opponent

jumping at an opponent

charging an opponent

striking or attempting to strike an opponent

pushing an opponent

tackling an opponent

There are three more offenses that result in a direct free kick if any player does them, regardless of carelessness, etc.:

holding an opponent

spitting at an opponent

handling the ball deliberately (except the goalkeeper in his or her own penalty area)