this question is about youth Ull-19
i am a fast learning referee who has learned alot in his two years of reffing,but there is one thing that bothers me the most.

i always fail to recognize a foul so here are some questions and please be clear/detailed what do the laws of the game mean when they say (under direct free kick fouls): jumps at an opponent, charges an opponent and what does impeding the progress of an opponent mean? Are there any other fouls that might not be mentioned in the laws?

Answer (November 15, 2012):
Both the “jumping at:” and “charging” fouls are punished with a direct free kick if they are done carelessly, recklessly (also a caution/yellow card), or with the use of excessive force (also a sending-off/red card). Together with “charging” and “impeding the progress of an opponent,” they are not described at any length in the Laws of the Game by the International Football Association Board (the people who write the Laws) because, as with many other things in soccer, “everyone knows that.”

1. Jumps at
Here is an article I wrote in 2006 for “Referee” magazine.
What is “Jumping At an Opponent”?
By Jim Allen

It is a general principle underlying the Law that players are not permitted to “play” the opponent rather than the ball. That is enshrined in the concept of “jumping at an opponent.” “Jumping at” means precisely that: launching one’s body toward the opponent. It can be from a standing or “flying” position. It can be done in two ways: (1) to intimidate or (2) in a feigned (really meant to distract or intimidate the opponent) or genuine but unsuccessful attempt to gain the ball. It is most often seen under the pretext of heading the ball, but may also be seen when a player launches himself through the air, feet first, to “tackle” away the ball.
Example. A8 is running upfield with the ball. Defender B3 jumps at A8 to startle him, causing A8 to flinch and lose possession.
What to do? B3 has committed the foul of jumping at an opponent if he does it in a manner considered by the referee to be careless, reckless or using excessive force. If the foul was careless, the result would be a direct free kick (or penalty kick if committed within B’s penalty area) for team A. If the foul was reckless, the result would be a caution/yellow card to B3 for unsporting behavior and a direct free kick (or penalty kick) for team A. If the foul involved excessive force, the result would be a send-off/red card for B3 and a direct free kick (or penalty kick) for team A.
Normally contact is not required, as specified by the word “at” in the name of the foul. However, another form of “jumping at” an opponent is the two-footed tackle, which by definition has to be a jump — launching one’s body toward that of the opponent. If that two-footed tackle is for the ball, it is likely fair, but if the jumping player lands on the ball just as the opponent’s foot is kicking it, the referee should consider the tackle dangerous and punish it with an indirect free kick. If contact is made with the opponent, give a direct free kick. If it is reckless, caution it. If it is done with excessive force, send the player off.
Faking. Another form of “jumping at” is to make the foul appear to have been committed by the opponent when the player with the ball has actually committed it. That sort of foul is common in youth soccer, where some players jump into an opponent and, while doing so, turn their back. Since that essentially makes them an unguided missile, it highlights the danger of jumping at an opponent with the back turned. Direct free kick for the opponent’s team.
Where to punish? At the spot where the opponent was affected by the jump. If a player starts his jump outside the penalty area but completes it inside, the referee must give the direct free kick (or penalty kick, if applicable) inside the penalty area.
There are two things to remember about “jumping at” an opponent. First, contact is not required for the foul. The foul is in the intimidation or distraction of the opponent by the jump. Second, this is one of those fouls where the “rule of thumb” about “playing the player rather than the ball” is particularly apt as a shorthand way of viewing the offense — the foul is almost certain when the offending player is looking at the opponent rather than the ball.

“Jumping at” has nothing to do with the foul of charging. “Jumping at” implies carelessness on the part of the player, while charging can be done fairly. If a charge misses, it cannot be a foul at all, but the way in which it is committed could be considered to be unsporting behavior.

2.Charges an opponent
The act of charging an opponent can be performed without it being called as a foul. Although the fair charge is commonly defined as “shoulder to shoulder” and without the use of arms or elbows, this is not a requirement and, at certain age levels where heights may vary greatly, may not even be possible. Furthermore, under many circumstances, a charge may often result in the player against whom it is placed falling to the ground (a consequence, as before, of players differing in weight or strength). The Law does require that the charge be directed toward the area of the shoulder and not toward the center of the opponent’s back (the spinal area): in such a case, the referee should recognize that such a charge is at minimum reckless and potentially even violent.

3. Impeding the progress of an opponent

Impeding the progress of an opponent means that a player moves into the path of an opponent to block that opponent’s ability to play the ball, but does not play the ball himself. That is an indirect free kick foul. As to the foul of charging that you emphasized, this is exactly what I told you it was. It is not described in the Law because, as with many other things in soccer, “everyone knows that.”