Why were myths written?

Back in Acient Greece these myths were thought to be true, to explain things that could not be explained. They are also life lessons.

Ex: Apollo's sister Artemis was in love with a human. Apollo didn't approve so he challenged her to an Archery contest. Being the Goddess of Hunting Artemis couldn't refuse. So they both shot at a target, moving farther and farther away. Apollo purposely misses the target. Artemis knew she could hit the target and she did. The target ended up being her boyfriend. Artemis was filled with grief and decided to put her once love into the sky as stars along with his dog. The stars, as you may know, are called Orion and Sirius. The moral of the story? Do not be blinded by pride, or don't let your pride blind you.

I hope this helps you understand more.