Epithets are the many different names for the Gods in Greek Theology. For example, Hecate’s name means “worker from afar”. However, when you place one of Her many epithets in front of Her name, her aspect changes. For example, if you call on Her in the aspect of Hekate Propolos, you are calling on her aspect as a guide and leader. You can find more information about Her epithets in an article called The Many Epithets of Hekate written by Mat Auryn on Patheos.
If you’re seriously interested in learning about Hekate and Her epithets, theology, and myths, I’ve listed some extra sources and reading material down below.