Buy at Low-Sell at High

hi all..
I work for a prop firm n my manager told a fellow trader that he got lucky in making money (for 2 yrs). he was just buying low n selling high.
Firstly i dont understand how anyone can consistently get lucky... and is there anything like buying at low n selling at high (basically trading reversals) and even if there is whats wrong with it makes u lucky regularly..
 
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