What is the most important thing a beginer should learn ??

HI , i started trading in feb , and went through technical analysis quite a lot , i have a decent understanding about macro economics , i trade small cap stocks (learning fx)
i am doing a lot of paper trading and trying to code for back testing , im currently lost trying to figure out what should be given prominence i don think that one should learn how every indicator works and im not interested in esoteric indicators and chart patters , and for my swing trading i don't use much...

What is the most important thing a beginer should learn ??

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