Kinda dry (sorry!) physics & mechanics:
Refresher of 4x4 basics
Using torque and traction wisely
Tire size and air pressure
Which lockers are best
Body protection
Stronger axles?
Hand signals
Automatic or stick?

Hands on:
Evaluation of challenges
Trail prep?
Minor field fixes
Gear selection
How to steer
Use of throttle
Use of clutch
Handicap of automatics
Strategic use of lockers
Signs of danger
Psychological challenges