Knife is a tool, which can be used for cutting, chipping and chopping, and will not affect people's fortune. In Feng Shui, knives are harmless, because Feng Shui is a superstition and has no scientific basis.
However, when using knives, you need to pay attention to safety, and don't use sharp knives to avoid injury. At the same time, we should also pay attention to the collection of knives, and don't put them in bedrooms and other places to avoid potential safety hazards.
In short, there is no hidden danger of geomantic omen in collecting knives at home, but attention should be paid to safety when using and collecting knives.