How to understand that calligraphy has rules, but calligraphy has no fixed rules?

Everything in the world has laws, and Taoism is natural, which means adapting to nature, imitating nature and adapting to nature. There are rules for learning calligraphy. Without rules, there would be no Fiona Fang.

As for the uncertainty of law, it depends on the understanding of each learner, and learning and innovating from law is the uncertainty of law.