Well, to start, Wicca is a branch of Paganism. Paganism has many different forms, but generally speaking, there is one great "All" or "Spirit" (think of this as the Christian God the Father). From there it's usually broken down into a duo-theistic approach, the God and the Goddess. Like yin and yang they represent the duality, the male and female, the summer and winter of life. Either from there, or skipping the duo-theistic part, it can be broken down into a polytheistic pantheon of deities. You're familiar with the Greek gods already, like Zeus, Poseidon, Athena and Hermes, etc... And their Roman counterparts, Jupiter, Neptune, Venus and Mercury.
So there's a super quick crash course in the concept of Paganism and Wicca. Wiccans tend to pick and choose their deities in my experience, some from this pantheon, some from that pantheon (and there are dozens or more to choose from!), some forego other deities entirely and work exclusively with the God and the Goddess. Some also work with spirit guides, but that's getting a bit deep for this conversation.
I don't know if any of that answered your question. But there are branches of Wicca and/or Paganism that focus almost exclusively on Goddess worship, and this often is what draws people in, trying to get away from the "male-dominated" religion of Christianity. I believe that male and female balance in worship is more healthy, but I myself am guilty of neglecting the masculine more often than not.
