Do swallows have any special requirements for address selection when building nests?

Generally speaking, swallows choose to nest in farmers, usually under eaves and corners. Bird's nest is rare in big cities, where it is too noisy to survive. Swallows seem to know their home. I remember learning a text about swallows in primary school, flying to the south in winter and coming back the next spring. I remember a photo of Zhang Xiaoming doing his homework in the house! I often hear the old man say that the swallow nests in whose house, which means that this family has good feng shui and good things, so don't bother!