I believe that so many traders have made certain mistakes that they wished they could go back in time to correct. Well mine was actually following advice from friends who posed as experts without doing my own research.
A friend would say "Buy this coin now coz it is going to pump in days or months to come" and without even thinking I would just rush to buy the coin- no research, no planning, no strategy, nothing at all.
This is the mistake most beginners always make: seeing their friends who have been into cryptocurrency before them as experts. They rely too much on them to invest in or trade whatever coin they have. It is very important for every crypto trader to do research before buying coins to invest in or trade. Cryptocurrency is personal, and everyone will be held responsible for their decision in engaging with the coin.
There will always be mistakes when people choose not to make the decision to learn first to know the right coins. Nobody is an expert in cryptocurrency.