9: Learning A Trading System by Gary Bielfeldt
Learning how a trend system works and executing it for a while will teach the trader the most important concept in trading: "Cut your losses short and let your profits run."
This is simple in theory, but seasoned traders know how hard it was for them in the beginning. This is a simple, practical way to internalize a core trading concept.
Gary Bielfeldt is considered to be one of the best T-Bond futures traders of all time.
Recommended Reading:
Market Wizards, Updated: Interviews With Top Traders
Market Wizards: Interviews with Paul Tudor Jones, The Art of Aggressive Trading and Gary Bielfeldt, Yes, They Do Trade T-Bonds in Peoria [Audiobook] [Audio CD]