(AP Photo/Richard Drew) I don’t have a history in the financial services market, but I have invested off and on over the years. I also happened to have one particularly close friend and a client who is a VETERAN — in all senses of the word — on Wall Street and in the hedge fund business. There are a lot of sources of information on the web right now that offer explanations about what has been happening with GameStop’s stock — and we’ve covered it here, as well — but here is my version which is something along the lines of “Shorting Stocks for Dummies.”