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Why start by testing with a core position? Essentially, it is to prevent drawdowns. A core position will tell you whether this trade is right or wrong. If it is wrong, you will only lose a little. If it is right, hold it and look for opportunities to add to the position. The core position will provide a backstop for your additional positions, ensuring that you will not lose. Always remember this saying: The market's money can never be earned completely, but your money can be lost completely! The prerequisite for winning battles is staying alive.