I would add two things. First keep your chin down. Pin it to your breast bone and move it as part of your torso; thats moving your head not those silly birdlike shimmies seen since tyson broke big. Second get your feet and balance right. Oh third, learn proper punching technique. Be amazed at how offense and defense are the exact same movements. { consider this; the move to slip a jab so that it goes over your right shoulder is the same as that of throwing a straight. Hence the straight right to the heart is the natural counter to a jab}