Don't chase returns: Avoid making impulsive decisions based on news or rumours that promise quick profits.
This is important to abide to and not to do it. I will rather say don't chase your losses. Allow your losses go and look for a new and fresh start. When you abide to this then you see yourself correcting your initial mistake and picking profit. Having to look out for lost money makes you to be less focus on the total body language of the market but rather you get focused on how to get your losses back but you will keep losing out. So it is important not trade because you want to revenge your losses.