Zen, the transliteration abbreviation of "Channa" in ancient Indian, means "meditation" and has a very systematic theory and method system. If you don't practice in the right way, it may be dangerous. The so-called "general computer addiction" in martial arts novels is indeed possible. The so-called "fire escape" means that if the qi and blood circulation during meditation cannot be well adjusted, the internal qi will retrograde or scurry, which will lead to various discomfort symptoms and even have serious adverse effects on the body. The so-called "possession" means that if the meditation method is improper or the theory is not clear enough, hallucinations and auditory hallucinations may occur. If not handled properly, it will lead to various mental disorders and even turn into insanity. So if you want to learn meditation, you must find a "master" who is proficient in theory and practice to guide you. You can take part in the training of "free meditation" first. As long as it takes two days, the teacher will explain the theory of meditation clearly and teach the most essential and safest method.