Ask What’s the best way to structure a content library on a membership site?

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I'm in the process of creating a membership site and need advice on organizing my content library. I want to make it easy for members to find what they're looking for, but I'm not sure how to structure it. Should I categorize content by topics, formats, or something else? How do I ensure it remains user-friendly as I add more material? I want my members to have a great experience, but I feel a bit lost with this part.

What's the best way to structure a content library on a membership site?