It could be about real - life events or incidents that are related to witchcraft in some way. Maybe it involves historical accounts of witch trials, superstitions, or unexplained phenomena that were once attributed to witches.
I'm not sure specifically as I haven't read it, but it could include examples like the story of a woman in a small village who was accused of witchcraft because her crops were always healthy while others' failed. Maybe she was just a better farmer, but superstition led to the accusation.
Sure is. The movie takes inspiration from actual happenings and portrays them on the screen. It aims to shed light on certain aspects of the history of the region.