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I learned a valuable lesson a few years ago when I invested in Apple when it was at 20. It kept going up and people kept saying that it was overvalued and that it couldn't go up forever. The iPod was a fad, blah blah blah.

Like an idiot, I listened to them and sold out at $35. Well, a stock split later the price is now $120. I basically lost out on a $210 increase per share. Seriously, I would have made enough money to buy a house had I stayed long.

The lesson I learned? Don't sell unless you have a reason to. I am holding on to my Nintendo shares unless I get some bad news. The price of the stock means nothing to me. I'm not a trader, I'm an investor.