For example, beginners in trading (such as I'm) tend to let losing trades run longer than necessary. On the other side, they tend to cut winning trade early without letting them fully develop. This is pure psychology and it is probably the hardest thing to master.
Lol, you got me laughing. Such is an experience. That is what I could call traders apathy. You fear that a profiting trade might not get to a certain high highs, you end it and the next hour, same trade is dancing at that same spot. But then, it is still better to take your profit when you think it fit because anything can cause the price reversal.