What is a Greek myths and legend?

Nobody can count them.

Zeus is in many greek myths. Lena and the swan, the war with the Titans, birth of perseus, Hercules, the tale of Troy, The Illiad, the story of Tiresias, etc...

a Greek myth or legend is a myth or legend originating from Greek origin. see, Daedalus and Icarus, Zeus,Poseidon, hades and thier father kronos, Theseus and the minotaur etcetcetc

Greek people made up gods, myths, and legends to explain everyday life. Therefore, the myths/legends were everyday life.

To explain the world around them and how it came to be, just like other cultres.