Boxing 2 : Jabs.
You jab with your left hand. Punch with your right.
Jabs are light punches to measure your opponents distance, to put him off balance and to hit him lightly.
If you find your jabs touching him before you fully lengthen your arm, then quickly step back. You are too close and your opponent can harm you with his punch.
So lesson 2 is to practice jabs without punching.
The trainer's name is Mike Rashid.