What did Circe warn Odysseus about?

his choices in his upcoming adventure scylla and charybdis (scylla is a monster, charybdis is a whirlpool) or the wandering rocks that are impossible to pass the sirens and how to prepare hyperion's (Apollo/the sun-god, same god) cattle, not to eat them

to not eat the cattle of the sun god, lord heliOS, lest he pay in death.