Why do you use he or she for non human things?

Answer 1

If you are talking about English language, for non-human things and animals we use pronoun "it". "he" or "she" can be used for animals or non-human things when a person is emotionally attached to it.

Answer 2

Using "he" or "she" for non-human things is a way to anthropomorphize or personify them, giving them a sense of personality or human-like characteristics. It can help create a stronger emotional connection between the reader or listener and the object being referred to.