Bad trading comes as a result of so many things:
Lack of proper research before trading is one of the reasons that cause bad trading.
Lack of strategy is another reason why most persons have bad trading; when one does not have a strategy to use in trading,it certainly makes him loose,because as the day goes by,so does strategies change in trading.
Lack of experience is also one of the reasons why people have bad trading.When they do not have experience on how trading goes,or how they will trade,it will certainly have an effect on their trading.