Not a serious discussion.
But most of the comments are really wrong. These fishing knowledge, mathematical knowledge, aesthetics, etc., cannot be piled up in order to increase the gorgeousness of the movie. They have to have a reason to exist to be unobtrusive.
In the film, the old man makes the actions of the protagonist interpretable, and the whole film is a reading angle. The knowledge about fishing allows the audience to understand the similarities between two seemingly unrelated things, because their essence is the same.
And this is true of many disciplines, just as practical things can be traced back to the theory. These things discussed by the old man not only make the film narrative more rhythmic and rapid, but also show that the old man's theoretical literature and women's life experience are connected, and what they experience is the same thing. It is also the director's performance of pointing out the relationship between literature, art and life.
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