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..
Well, that coin is almost dead now. Investing without doing research is like suicide, you don't know what's waiting in you ahead but if you get lucky then you're lucky.
But most of the time, those that don't do research and are greedy, always fail in the end. There's no one to blame for that mistake of theirs but only themselves and as you stay in the market, the only thing that you can do is to learn from that mistake.