It is normal to have losses in trading but it is wise to be able to control the amount of losses. However, for every trade you must keep in mind a few things. In doing so you need to keep an eye on the market, keep an eye on the future development of the coin, above all you need to have complete cognitive prior experience.
Investors know that losing is part of trading and any type of investment. But with calculated risk, they know what to do and where to invest their money. A series of loss isn't going to stop them from investing yet, it's the lesson that they're going to learn and apply with their future decisions about trading and investing.
That's why when the negative things comes to them, they're chill and don't panic because they know how to react.