DON'T fall in love with a stock. By that I mean, if a stock is approaching your previously established stop loss price, don't change your stop loss just because the stock has been good to you; you've made a tidy profit and you want to give it another chance to turn back up.
For sure the stock has no loyalty to you. It will turn on you faster than a raging tiger.
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Diligence is the mother of good luck.
Ben Franklin (1706-1790)