What is the main conflict in The Odyssey by Homer?

The Odyssey is an ancient Greek epic telling the story of the hero Odysseus’ journey home from the Trojan War. He battles monsters and magic, loses all his men, is shipwrecked, and finally washed up on the demi-goddess Calypso’s shore. She keeps him with her for years before the gods intervene. He tells his story to the Phaeacians, who then take him to his home on Ithaca. He fights the suitors who have invaded his home and is finally reunited with his family.