12: Find Your Trading Niche by Charles Faulkner

To succeed in trading you cannot be a Jack-of-all-trades. You need to pick your niche and become an expert in it. You can`t be day trading stocks today and playing a macro theme in emerging markets next week. Find an approach that suits you and become an expert in it.

Charles Faulkner on Wikipedia

Recommended Reading:
The New Market Wizards: Conversations with America's Top Traders