basic question
How can i invite someone to view my research, highlights and notes? This would be easiest for my professor to see my research but am unsure how to add him...
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You can put all your stuff in a group and invite him. Unless you want your group public (in which case, again, everyone could view it) he would need an account, yes.
https://www.zotero.org/support/groups
https://www.zotero.org/groups/123456/items
He'll be able to access that. No need to log in or create an account for a public group.
https://www.zotero.org/support/sync
(but note that the URL I give above is the generic _form_ of the URL, it's not the right URL.)