I think from the research I did from a number of people I saw new people around me many new people or these new traders got losses because they could not control their patience and they sold coins at very cheap prices and that was a loss because they bought it when prices are expensive, they are panicked and cannot control their patience, and 90% of the 100 people I research, mistakes are often made by new traders who do not know how to trade properly and correctly.
This was already mentioned by people at here that most of beginners mistakes is they will always be the victim of FOMO which mean they will buy high and sold at cheap price and sometimes this cause also can makes newbie quit to trading because they fear to buy again