one of the most fundamental ones is "back up". And doing this without you, yourself, moving your feet. So, sending the horse away from you with just the line shaking or the use of your fingers "pushing" air and signalling him to back up.
Once you get this, then have your horse learn to stand a good 6 feet away from and just stand there while you are busy doing whatever you need to do. It's a very good excersize to teach a horse to stand and rest away from you, especially if he's one of those hores's that want to be right up on your shoulder all the time.
Send him back away from you then let the line just droop. mayb let it rest on the ground even (you need a 12 foot lead rope). If horse moves, put him back with a shake of the rope. once he stands for a good minute, then go over and pet him if he likes that. Or, just him be, standing and resting.