Why Forex trading need A Planning?

In many article I saw people write that trading plan is must and we should make a plan before we make any trade. But the reasons are not clear to me why we need a specific trading plan to follow. because market moves all the time and these movement is always new so it is difficult to trade within a plan rather better to apply new strategy every time. So I can’t understand what the necessity of a plan is. Please share your knowledge.


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