Small investors have found many ways to lose money in stocks. I could write a book about it. As a matter of fact, that's what I am doing here. Whether you invest in equities, bonds, options, ETFs or mutual funds, there is a way to generate losses quickly.
The worst part is, the more you lose, the more desperate you are to find a way to get it back, and that generally leads to more losses. The best thing you can do is stop the losing cycle.