but teaching them to catch the ball is not really the job of the WR coach- if they can't 17'ing catch, it's on the WR and he needs to become a DB or learn how to block really well...there are some little things you can teach them to help a little, but either they have good hand-eye coordination and can catch it or they can't for the most part
a WR coach teaches them how to run routes properly, footwork, positioning, how to read coverages, proper blocking techniques, how to set up DB's...a college WR can either catch or he cant for the most part