Thinking about it, over the years losing money in the crypto world mainly because I believed these phrases:

"Spot trading is safe"
"Altcoins won't follow the dip"
"It's already down 95%, can't go lower"
"This project has real income, the coin is undervalued"
"This time is different"
"The project received funding from major institutions, strong backing"
"The team is delivering results"
"Bitcoin is sideways, altcoins are about to catch up"