That's a pretty general question. Every woman is different. We like to talk about our interests, and as every woman's interests will vary, so will their chosen topics of conversation. I would try to figure out their interest first, then ask more about those. Family is usually a good topic, and a good starting place.
Women often love to talk about other women, typically in non-flattering ways. They also enjoy discussing celebrity lifestyles, fashion, men, some aspect of their bodies, and other seemingly mundane topics.