Alright, so the 'Poseidon' comic reading order has a few quirks, depending on how deep into the lore you want to go. The main sequence kicks off with 'Poseidon: Rites of Passage', which sets up the whole mythos. From there, you jump to 'Poseidon: Tempest's Wrath'. A lot of folks don't realize there's a miniseries, 'Poseidon: The Lost Tides', that runs parallel to 'Tempest's Wrath'. You can read it after or during—it adds context but isn't strictly mandatory for the main plot. The official chronology ends with 'Poseidon: Throne of the Abyss'. There are a handful of one-shots, like 'Poseidon: Siren's Call', but those are more like bonus lore drops you can check out anytime after the first two arcs. Honestly, the publisher's website has the clearest timeline, but some reading apps bundle them in the wrong order, so watch out for that.
My personal take? I read 'The Lost Tides' first by accident, and it actually made the protagonist's motivations in 'Rites of Passage' way more understandable. Sometimes a non-linear approach works if you don't mind a few early spoilers. The art in the later issues gets really intricate, especially with the underwater city designs, which is a cool reason to see the series through.