Who does Odysseus kills first and why?

Odysseus kills the first suitor, Antinous, upon his return to Ithaca. Antinous is the most arrogant and aggressive of the suitors, leading the campaign to marry Penelope and disrespecting Odysseus's household. By targeting Antinous first, Odysseus sends a strong message to the other suitors about the consequences of their actions and reclaims authority over his home.