Knowledge is very important when it comes to experiencing forex trading, it will be a make it or break it for you in your trading journey.
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The fact that we can make mistakes even after experience, as you mentioned, really clarifies our knowledge and practical execution. Like in trading we can gain as much knowledge as we want but until we try it out and learn from our mistakes it brings no good.In my opinion, when you trade with proper knowledge and understanding you will get a fruit result. But if you are working on something without proper knowledge it will lead you to mistakes. So, knowledge and experience come in handy.