My house was dark when the lights were turned off. There has been a sound, as if someone were talking. Am I hearing voices or is there a ghost at home?

Hearing voices, you've seen too many ghost movies. I am a medical student. I do experiments, see corpses and do autopsies every day. If there were ghosts, I would have seen them long ago. Don't be afraid, want sunshine, walk more in the sunshine, watch more jokes, smile more, and when you are in a good mood, you will naturally have less auditory hallucinations. If there is, ask a counselor. There is also a scientific explanation for auditory hallucinations.