What is the meaning of "Big Fish Begonia"?

After watching "The Big Fish Begonia", it is a meaningful movie that comes out of the cinema surrounded by problems. Now let's talk about some far-reaching meanings in the film that we can't understand.

First, what are the rules of the world they live in? After watching the movie "Big Fish Begonia", this problem is right beside me. In their world, they control everything in the world by themselves, and there are often gods in their families, but they don't explain how these gods inherit from each other.

Second, the two-headed snake in the coffin. There is a plot in the movie, that is, Qi Hechun watched Kun's little fish play by the lake, and suddenly found a coffin next to it, and then opened it. I didn't expect it to be a sealed two-headed snake. After the coffin was opened, the two-headed snake bit Chun, and Kun jumped to save her, but he was bitten himself. One thing I don't understand is why it is a sealed coffin and a poisonous two-headed snake. Why put it so simply instead of finding a place for it?

? Third, is fate predestined? In this movie, I feel that a person's fate seems to be doomed from birth. If you don't attend the bar mitzvah, you won't go to the world and meet Kun. There won't be so much after that. Everything is decided by accidental and inevitable factors, just as the spiritual woman in the play said. Good luck and bad luck are your destiny? We can't hide, and we can't hide.

These three questions are what I think after reading them. "Big Fish Begonia" is an excellent domestic animation, which can arouse some waves in people's hearts. After reading the above three points, I think there will be other far-reaching things.