Can someone help me understand difference between Moderator and Staff?
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The “Staff” includes moderators and administrators. “Moderator” includes only moderators.
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Okay makes sense! And difference between Whisper and Staff notes? Are they the same thing?
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Well, they are almost the opposite:
- Whispers are private conversations only visible to staff:
- Staff Notices are shown to everyone:
The screenshots don’t really tell the story. These are what staff (or whoever is configured to see Whispers) sees, but the ordinary user is only going to see Staff Notices.
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By Staff notes, are you referring to this plugin: Discourse User Notes?
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Whispers are notes that you can add to posts. They are private conversations. You might be interested in the
whispers allowed groupssetting to control what group can create/see those private communications. -
Staff notes from the plugin allow the Staff to add notes to a specific user. You can look at the plugin topic for more details.
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Yes, this gave me better understanding. What about the Staff Colour for a post, what’s the use of that?
Staff color adds a background color to your post like GDPR outside of the EU - #37
Maybe Discourse Moderation Guide also answers some of your questions
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To make a post stand out, it is highlighted with a background color.
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Moderators and Admins are staff, but I don’t think Category Moderators are staff.
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I’m confused, could you tell me difference between Moderator and Category moderator?
Search is your friend 
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There’s also a bit more info in Understanding user statuses, roles, and permissions that you may find useful. 
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