If you want to be profitable in trading, it is vital to have an edge in trading. Trading is like running a business. A profitable businessman will look at their best selling products and also focus on those that give a better margin(lower cost, higher profit). Well, there are similarities in trading; products are the instrument that we trade, the currency pair, gold, silver, oil, grain, etc. Which instrument gives you a consistently good return, focus on that. When a trade that gives you a 2:1 Reward is to Risk Ratio, focus on those, or only trade those. It gives you an advantage in trading.