Who is Hades?
Hades was the god of the dead, who ruled the place where dead people went after they died (Sometimes people also called the underworld "Hades"). He is a rather shadowy figure in more ways than one, spooky and cruel, and the Greeks preferred not to talk about him too much. Generally people who had good intentions did not sacrifice to Hades either. People sacrificed to Hades when they wanted something bad to happen, like if they were trying to get revenge on an enemy.
they did, instead of burning the fat and the bones so the smoke would
go up to the sky, instead they poured blood into pits or ditches dug
into the ground (as in the part of Homer's
Odyssey where Odysseus visits
Hades was thought of as the brother of Zeus and Poseidon, and therefore also the brother of Demeter and Hera.
Persephone and the Pomegranate: A Myth from Greece, by Kris Waldherr (1993). . Not cheap, but beautifully illustrated.
Myth-O-Mania: Have a Hot Time, Hades! by Kate McMullan (2002). - a "cool" retelling of myths from a different point of view.
D'aulaire's Book of Greek Myths, by Edgar and Ingri D'Aulaire.
Greek Religion, by Walter Burkert (reprinted 1987). By a leading expert. He has sections on each of the Greek gods, and discusses their deeper meanings, and their function in Greek society.
Aspects of Death in Early Greek Art and Poetry, by Emily Vermeule (1979). She's an expert on early Greece, and this book goes into detail about what the Greeks thought happened to people after they died. For adults.