4. Have written trading rules, and follow those rules diligently.
5. Follow the overall trend of the market, and let the market signal to you when to buy stocks and when to sell. Stocks are highly correlated to the market and therefore it is vital to follow the major indexes.
8. Never add to a losing position. Never average into a trade, or double up. Never average down. Cut your losses first, and quickly. The first cut is the best.