The sirens, Charybdis, and the island of the sun. He did not, however, warn them about Scylla.
Not to eat the lotus plants
the dangers that he would face at sea that is what circe warned odysseus.
bc @ least 6 of his men would be eaten.
Because then his men wouldn't want to leave.
Odysseus did not want to agitate his men and he didn't want them to go belowdeck for fear that Scylla might destroy them all. So, he didn't warn them.
Polyphemus is a Cyclops who traps Odysseus and his men in a cave in Homer's epic poem The Odyssey. He is blinded by Odysseus and his men as they escape, leading to Poseidon's anger towards Odysseus. Polyphemus is a symbol of the dangers that the hero faces on his journey home.
If he were to tell his crew about the dangers that awaited them they never would have sailed.
Calypso told Odysseus that if he did not sacrifice six men to the Scylla he would lose his whole ship to Charybdis. If he had told his men of the dangers they might not have agreed to sail through Scylla's passage.
The Laestrygonians, a race of giant cannibals, treated Odysseus and his men violently and aggressively. Upon their arrival, the Laestrygonians attacked the ships, hurling massive rocks and destroying many of them. They captured and devoured a significant number of Odysseus's crew, leading to a devastating loss. This encounter exemplified the dangers Odysseus and his men faced on their journey home.
Circe's and Teiresias' last prophecy to Odysseus is that he alone will survive the journey. They also warn him against harming the sacred cattle of Helios, which ultimately causes the death of his men.
Circe hinders Odysseus by first turning his men into animals and delaying Odysseus' progress. Once Odysseus manages to resist her spell (with Hermes' help), Odysseus then take her to bed for her to turn his men back into humans. For a year after, Odysseus feasts and stays with Circe, which further delays his return to Ithaca. When Odysseus and his men feel it is time to leave, Circe helps Odysseus by advising him to visit the prophet Teiresias in the Underworld. There he learns of the dangers ahead of Scylla, Charybdis, the Sirens, and Helios' cattle.
Eat The Halios' Cattle