my worst mistake was in 2017,my gain was 1000$ from 500$ in the bull market and then  i got greedy and acted blindly.
i went all in ZCL without putting stop loss and also without making any research, later the coin dumped very badly and i lost all my gains besides half of my capital and that was very awful for me,thats a lesson i have learned which is  cut ur losses and also always use stop loss..