Ask What’s the best way to track user activity on a membership site?

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I want to track user activity on my membership site, but I don't know where to start. I want to see which pages members visit the most and how they interact with the content. I also want to know if they complete certain actions, like watching videos or downloading files. Are there tools that can do this without slowing down my site? Do I need special plugins, or is there a built-in option on most platforms? What's the best way to track user activity on a membership site?