The rules in trading that you must understand.
1. Don't chase price. If the price has gone up, don't buy, wait for a correction.
2. Don't swallow other people's advice completely. Do more in-depth research.
3. Don't put all your money in! Use 10% of your money for each open position.
4. Take a break from trading for a few days if you are having a bad day. Don't force trading, it's just a waste of money.