the most important thing is that you don't trading with emotions and do a panic sell, the meaning is
1. emotion
You buy when you see the price going up and don't do your research first, so you buy when the price is really high
2. panic sell
when the price dump and you are immediately afraid, so you do a panic sell and of course it makes you lose your money

therefore if you want to trading, then you must do your research before investing and never do a panic sell.