I used to tell my students to make sure that it was tied down well, to something really secure. It helped to point out that the wing was designed to lift 2500 pounds off the ground in a 60-MPH wind, and so tying to any object weighing less than thousands of pounds, or anchored deeply in the concrete or soil, was a waste of time. Taildraggers are much worse, too, since their AoA is already ideally set to lift off at low airspeeds.
Another common fault is the use of ropes that are completely insufficient for the job, or ropes or straps that have deteriorated in the sun and rain. As above, they have to resist some powerful pulling. The knots used are also critical.
Stall strips can greatly reduce the lift. I used, on a Champ I had custody of for a few years, long 2x4s with a bit of carpet to protect the wing, tied down with straps around the wing. The boards are placed a bit forward of the max thickness of the wing and will destroy the lift by causing massive turbulence.
We taught students fuelling as well, and the dangers surrounding it. Wearing synthetic jackets in cold weather, for instance, can generate static electricity as you rub against the wing when fuelling. Fuelling anywhere near a thunderstorm is also discouraged; in fact, there's a Canadian law on that one for certain operations.
Fuelling with Passengers on Board
604.83 (1) No person operating an aircraft operated by a private operator shall permit the fuelling of the aircraft while passengers are on board or are embarking or disembarking, unless
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- (l) the fuelling is suspended if there is a lightning discharge within eight kilometres of the aerodrome;
There were some other things about fuelling, like
not letting the neck of the fuel tank support the nozzle and hose. We had to remove numerous fuel tanks over the years for expensive steam cleaning and welded repairs to cracked aluminum around the neck that leaked fuel into the wing, and broken baffles and fuel sender guard plates in the tank. These things are NOT made like the fuel filler in your car and can't take the weight of that big nozzle and the hose. It will bend the neck and fatigue the aluminum.