Here are some thought by some of the best stock traders. Good trading principles apply in all markets.
Also, everyone who is truly interested in Forex should read as widely as possible.
Jesse Livermore: The World’s Greatest Stock Trader by Richard Smitten

1. Don't lose money
2. Always Establish a Stop
3. Keep Cash in reserve
4. Let the (Successful) Position ride...until you have a Clear Reason to Sell.
5 Take the Profits in cash...and place 50% in a separate account
Lessons From the Greatest Stock Traders of all Time by John Boik

1. Trade with the Trend
2. Cut Losses short
3. Let Profits run
4. Manage Risk
How Legendary Traders made Millions by John Boik

1. Understand the General Trend of the market
2. Use the Knowledge of History in your Study and Observation of the Markets
3. Use your Own Research and Don't Listen to Others
4. Buy the Leaders
These summaries of good traders thought are worthwhile. We thought that you might be interested in what other good traders think about the markets and how to trade.