1. The first and most important rule is - in bull markets, one is supposed to be long. This may sound obvious, but how many of us have sold the first rally in every bull market, saying that the market has moved too far, too fast. I have before, and I suspect I'll do it again at some point in the future. Thus, we've not enjoyed the profits that should have accrued to us for our initial bullish outlook, but have actually lost money while being short. In a bull market, one can only be long or on the sidelines. Remember, not having a position is a position.