Short answers, pulled from the story.
Rhea was one of the Titans, daughter of Gaia and Uranus, and sister and wife of Cronus. She was the mother of the six Olympian gods: Hestia, Demeter, Hera, Hades, Poseidon, and Zeus. In early Greek tradition she was known as "the mother of gods."
Rhea gave Cronus a stone wrapped in swaddling clothes to swallow in place of the infant Zeus, then hid Zeus in a cave on the island of Crete. She devised the plan with help from Gaia and Uranus. Warrior attendants known as the Kouretes and Dactyls guarded the hidden child.
After Zeus's rise, Rhea attended the birth of her grandson Apollo and raised her grandson Dionysus following the death of his mother, the mortal princess Semele. When Hera inflicted Dionysus with madness, Rhea healed him and gave him the amethyst. The poet Bacchylides credited her with restoring Pelops to life after his father Tantalus slew him.
Temples to Rhea under the title Meter Theon, "Mother of the Gods," stood in Anagyros in Attika, Megalopolis in Arkadia, on the Acropolis of Ancient Corinth, and in the Keramaikos district of Athens, where the statue was made by Pheidias. Olympia had both an altar and a Doric temple called the Metroion. Her oldest sanctuary in the Peloponnese stood at Akriai in Lakedaimon.
Rhea and the Phrygian goddess Cybele share nearly identical iconography, with both shown wearing a crown, seated on a throne flanked by lions, or drawn on a chariot pulled by two lions. Some ancient Greeks regarded Cybele as their own Rhea, who had fled her original home on Mount Ida in Crete to the wilds of Phrygia. The Romans equated their Magna Mater deorum Idaea with Rhea and also identified her with Ops.
The second largest moon of Saturn is named Rhea, after the goddess. The large flightless bird called the Rhea also derives its name from the goddess. WWE wrestler Rhea Ripley was inspired by the goddess Rhea when creating her stage name.