Always keep the vehicle behind you in view (as much as is reasonable).
Watch the vehicle in front to see the best route to take over obstacles.
Pick up any trash you may see around the trail. "Pack more out than in!"
Use your 4-wheel drive. Bragging about NOT using 4wd on trails, where others usually do, does not indicate you are a better driver, let alone a better off-roader. It likely shows you are simply willing to tear up the trail AND your vehicle for some kind of bragging rights. Experienced wheelers will not be impressed.
Ask for and/or accept help when necessary - spotters can assist when in difficult terrain.
Slow is the way to go over rough terrain (drive like there's a crate of eggs in the back).
When encountering large obstacles, such as rocks or stumps: if you can't go around, don't straddle them. Put your tire on it and crawl over slowly.
(Learn about rocker protection.)
When stopped with the engine off, apply the emergency brake or put manual transmissions in low gear to avoid accidental rolling. NOTE: Don't use the emergency brake when the temperature outside is below freezing. It may freeze in place.
When coming off a straight edge (with a moderate drop), it may be better to do it at a slight angle. Turn the wheels right or left, letting one wheel come off first.
Secure/Tie Down loose items in the cargo area of your rig (cooler, toolbox, fluids, passengers ( lol), etc.).
Don't forget to air up before heading home.
When you get home, wash the mud and dirt from on and under your vehicle. Be sure to clean your catalytic converter, brakes, driveshaft, etc. This is not just a matter of having a clean rig. It is also about protecting the environment. When wheeling offroad, you can collect seeds of plants we drive through, over, or just by. The seeds can be in the mud or just hitching a ride in dust in the frame or suspension. Washing your rig after a trail ride will help keep from spreading noxious weeds. (it also makes the Forest Service very happy. )
Wheel Safe!! Be careful! And, of course, have fun out there.