Trading is not a game or something just for fun. Trading is a job involving a busy schedule and stress. It requires knowledge, analytical skills, and courage in decision making.
Trading also requires self-control that can keep a trader from making mistakes.
By learning and skillfully applying certain psychological tricks, you will have a definite advantage over those who don't interest themselves in trading psychology. It's not without reason that some of the best professional traders are psychologists. As correctly noted by Eric Najman in his book "Trading Pocket Encyclopedia", "the knowledge of one's own abilities and preferences, positive, and negative qualities can help avoid losses. If you can adequately assess the psychological state and the behavior of the market players along with that knowledge, your success is guaranteed". We can add that perhaps the most crucial fight in trading is the one with yourself.