There are hundreds. Here are just a few:
Remain calm
Don't hike alone - take a friend
Keep a cell-phone with you
Don't eat unidentified plants
Don't move an injured person if there's any doubt as to what is hurt
Know how to handle fire (this itself has a number of rules)
Take a first-aid kit, water, high-energy food, and appropriate clothing
Tell someone what your planned route will be
Pay attention to weather forecasts
etc.
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