Traders often go through emotions like fear, greed, frustration, hope, regret, overconfidence, etc. But successful traders know how not to let their emotions ruin their trades which is the real meaning of trading psychology.
To improve your trading psychology, you will have to work on reducing the extent of emotions controlling your trades. Have a strong knowledge base so that all your decisions are based on logic and facts. Note how successful traders trade and learn to make smarter trading decisions.