Investing doesn't come easy and it is actually a learned art that changes on a daily basis. However, the principles are always the same and a long short mutual fund investment is usually a solid investing method. Investing is risky, but hedging the risk by using separate investment approaches. Any long short mutual fund manager will typically choose stocks they predict will outperform other investments. These stocks will be added to their portfolio, but something must be done to reduce the general market risk. In this case the long short mutual fund manager needs to find stocks that won't perform as well s other equities so that they may be sold short.
The general idea behind the long short mutual fund is that no matter what direction the market is going any fund that has well chosen investments will perform well. For example, when the market is on an uptrend then the fund's stocks may perform exceptionally and the short funds may rise somewhat along with the rest of the market or even fall. However, if the market is in a downtrend then the short stocks should provide a decent return and potentially cover any losses that might result from stocks that were purchased.