Chasing ups and downs, emotional operation
When the price is rising, rush in, thinking "buy early and make money early", but end up buying at the high point; when the price is falling, sell at the lowest point in a panic.
Classic scenario:
"This coin has risen by 20% today, I'll get on board!" - As soon as I bought it, it started to fall.
"This coin has fallen by 30%, when will I run?" - As soon as I sold it, it started to rise.
If you don't know how to screen strong coins, then I suggest you follow me.