I actually have no only one rule, for me the most significant rules are never rely on luck and think twice before do some actions (it applies to a real life too). I suppose that luck is such a thing which always confuse rookies in trading, because they naively think that luck has 1/3 in trading. However, of course it's not. Luck never matters and thus I advice never rely on it. About the second trule, everything is quite clear here I guess. It would be better to stay off openning a poisition rather than rushing, because it may costs you a lot.