Who did Odysseus fight in the Odyssey?

In the "Odyssey," Odysseus primarily encounters the suitors vying for his wife Penelope's hand during his absence. He also faces various mythical creatures and challenges, including the Cyclops Polyphemus, the enchantress Circe, and the Sirens. His journey home involves battles of wits and strength against both human and divine adversaries, ultimately culminating in a violent confrontation with the suitors upon his return to Ithaca.