When people talk about non-physical substances like souls, they are participating in dualism. The idea that the soul can survive the body as its own object creates a new kind of object. This is nonsense, as this video will help you understand:
Since ancient times, many attempts have been made to account for the relationship between mind and body. This video examines the inherent flaws in the philosophy of substance dualism, along with some of the fallacious reasoning often put forward to support it.