Ask What are the must-have features for a successful membership site?

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I want to create a membership site, but I don't know what features it should have. I want it to be easy to use and keep members engaged. I've seen sites with different dashboards, content access levels, and community features, but I don't know what's essential. Should I include forums, live chats, or exclusive downloads? What tools help with managing members and payments? I don't want to miss anything important. What are the must-have features for a successful membership site?