How about some simple no brainer stuff:
#1. When stuck, lower your air pressure and use anything in your surroundings for traction. i.e. Wood, Rocks.
#2. When you are out in an OHV park, always expect a squid on a Quad to be coming around the corner at hero speeds.
#3. You can never have enough windshield washer fluid.
#4. Dont be a jackass, thats how you kill yourself or others. Drive within your ability and you will be respected, rather than pulling a dumb shit move trying to show off and ruining your's and maybe others day.
#5. When in deep sand (river bottom) never make too tight of turns, always gradual. You hit the limits on your steering and you will be stuck in most any vehicle. My Jeeps seem to be pretty unstopable.
#6. There is only one way to learn, and thats doing it. Whether its the right way or the wrong way. Usually I learned my lessons when being unprepared or doing something totally wrong.
#7. When approaching a rock garden of any size, expect trouble and proceed with caution. Just because you saw a video or watched your buddy go up in front of you, does not mean things will go so smoothly for you. Rocks can be unpredictable and shift around before you know it. If you hit a bunch of smaller sized rocks at high speed you very well may end up with a hole in your oil pan.
#8. Check the weather report.
#9. Slow down and really be sure you are prepared for your trip whether its a day or a week. I have gone out to local trails (5 mins away) and have been stuck without my shovel, PSI gauge, Tool bag etc.
#10. Mudding was fun when I was 16, now its just a pain in the ass. If necessary sure ill go through. But I will avoid it if possible. Hell of a lot of fun. But its the beginning of a mechanical problem.
#11. When approaching anything off camber, look at the consequence before continuing. Know that if you begin to roll, turn into the roll and dont be afraid to hit the throttle.
I could go on for days but these are things you learn when the situation approaches you somewhere along the line. Everyone learns if they put themselves out there and challenge themselves.