Okay kiddo, let me explain Potnia in a way that is easy for you to understand. Potnia is actually an ancient Greek word that means "lady" or "queen".
In ancient times, people used to worship many gods and goddesses. One of the goddesses they worshipped was called Potnia. She was believed to be the goddess of nature, animals, and fertility.
People used to offer sacrifices to Potnia in order to ask for her blessings. They believed that if she was happy with their offerings, she would bless them with fertility and abundant crops.
In some ancient art, Potnia was depicted as a woman with an animal on each side of her, such as lions or snakes. This was because people believed she had power over animals and could communicate with them.
So that's it, Potnia was an ancient goddess who was worshipped for her power over nature and animals.