Never Mix Disciplines.  If you day trade then day trade and do not let a day trade turn into a swing trade.  If you swing trade do not let your swing trade turn into an investment. Follow the rules based on the discipline of your time frame.

  Never Try To Trade Back A loser.  In other words, each trade is a new one and should not be used to win back money lost in the last trade.  Always trade in the present not in the past where too many emotional and psychology factors can affect the current trade.  Revenge does not pay in or out of the market.