To control greed, of course, through a learning process, where we must increase our experience in trading so that we are faced with various conditions in the market. to a wider extent we must be able to control the psychology of trading, where each person will be different at different times of achievement. this is very useful for suppressing greed in taking profits that usually occurs and obeying the cut loss area
Greed stops us from taking profits even you're already there. It's a matter of the satisfying the amount of profit and the goal that you're setting for yourself.
But if the market can do no longer good then you have to make sure that you have at least taken some decent profits that will make you feel good before the market goes down.