One of the most common mistakes beginners make is that they only care about their trading strategy and win rate and completely ignore risk management. This is one of the top reasons why most traders fail as well. Often times beginner traders need to learn things the hard way before they realize what is truly important. The reason why most traders lose money is also because they just estimate their risk exposure while professional traders are experts in risk management.
This applies to you whether you're in forex, stocks, bitcoin or commodities.
