Live Stock Market Usa

I need help with my project in return?
i can have a project in my business class. I have to buy a stock, the shares more profitable I need to keep this stock for ten days and calculate. I do not know how to do it at all. I do not know how well a good stock to invest. can u guys help me please I am lost. I live in California United States also want to know what a good stock investment in a day of thanks
A car manufacturer (Ford, GM) or bank (AIG, Washington Mutual) is a good stock to buy now.
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