"Retail traders (amateurs) are often right, but at the wrong time."
That's a quote from one of my trading mentors and I found it to be one of the most important things I ever learned.
It explains why so many traders enter a trade, quickly get stopped out, and then the market resumes in the original direction of their trade. They failed to TIME the market correctly.
You can be very educated about the markets, but if you don't know EXACTLY when and where to get in and out, all the education in the world won't do you much good.