In Greek mythology how do you get prophecies from angels or oracles?

Angels do not appear in Greek mythology. Instead, prophecies can be made by oracles or seers. Oracles are individuals or priestesses who are believed to be in contact with the divine and can deliver messages or predictions from gods or other supernatural forces. Seers, on the other hand, possess the ability to see visions or have insights into the future through their supernatural powers. Both oracles and seers play significant roles in Greek myths and stories as they provide guidance, warn of dangers, and reveal destinies to mortals.