What does the fortune teller mean by tying a red rope to your wrist?

What does the red rope on the left wristband mean? Is there anything special? Are there any taboos?

This is actually a custom. The reason why I wear my left hand is because this person should be a man, because there is a saying that "men are left and women are right". Actually, this is an old saying. In order to ward off evil spirits, I have a red rope woven by my mother on my left foot. Sometimes unbelief doesn't exist, and faith does exist. This is not right. Not believing is just a psychological "strengthening" of oneself. Faith is actually a kind of preparation. Don't deny everything. I really want to see a ghost. Because I think "ghost" is a kind of energy after "body" is consumed. Because energy is visible in some cases. So there is a good chance to meet this kind of "ghost".