It is never gonna to happen given such a volatile market, people always make bad or wrong judgments about when to buy and sell. So if you want to know ow to trade without suffering any loss, I would tell you that there is such a thing in the crypto world. However, you do can try to keep your loss under control and make some better moves if you do your due diligence and background checking and also take some professional trader's advises as reference. Also, you also need to follow one rule that is always keep your private keys in a secure way and do not share it with anyone else, otherwise you may lose them forever.