What aspect of culture includes values and beliefs shared by a group?

The concept being described in the question pertains to norms, which are the unwritten rules and shared expectations that guide behavior within a group. Norms encompass the shared values and beliefs that influence how group members interact and make decisions. They serve as a foundation for social behavior and create a framework within which individuals understand what is acceptable or expected in their social context.

On the other hand, while traditions relate to practices and behaviors that are handed down through generations, they do not necessarily capture the entirety of values and beliefs held by a group. Language serves as a tool for communication and cultural expression but does not directly define the underlying values and beliefs. Artifacts represent the tangible expressions of culture, such as tools, clothing, or art, but like language, they are manifestations of the culture rather than the values and beliefs themselves. Thus, norms are the most fitting answer as they specifically encompass the shared values and beliefs that are integral to a group's identity.