Whom does Odysseus kill first and why?

Odysseus first kills Antinous, the leader of the suitors, upon his return to Ithaca. Antinous is the most arrogant and disrespectful of the suitors who have invaded Odysseus's home, consuming his wealth and courting his wife, Penelope. By targeting Antinous first, Odysseus sends a strong message to the other suitors about the consequences of their actions. This act marks the beginning of his reclaiming of his household and authority.