David beckham became good at swerving his shots because of his uncanny ability to handle his right foot. His well controlled right foot was a key factor in making his swerving shots effective and a certain threat to goalies. This technique was especially effective for football players who were right footed.
He was of course mostly known for his crossing ability and his powerful and accurate free kicks. He has been known and respected as one of the greatest midfield players of all time. These various techniques made him a well rounded player and added to this, he was able to inspire others on and off the team.