When I started trading, I created a strategy based on short-term historical data. I thought the good results I achieved were enough to rely on in the real market. I entered confidently, but soon the market conditions changed, and the strategy failed clearly. I realized that limited data does not reveal underlying weaknesses and does not represent all market scenarios. I learned that testing the strategy over long time frames and in various conditions is essential before relying on it. The market does not always move in a clear direction, nor does it repeat in the same way, and a strong strategy is one that withstands change.
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