FOMO and FUD are two emotions that control the markets.
FOMO is the Fear Of Missing Out. It happens when price is pumping and you buy at the top because you are afraid of missing profits.
FUD is Fear, Uncertainty, and Doubt. It spreads when negative news hits, causing panic selling at the bottom.
The key to success is managing these emotions. Do not buy because you are euphoric. Do not sell because you are scared. Stick to your plan.