Creating a New Collection
By default, Zotero stores new citations in "My Library." You can create multiple folders, or "collections" to organise your research by topic or assignment.
To create a new collection:
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Right click My Library and click New Collection. You can also click the 'New Collection' icon on the tool bar to create a new collection.

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Give a name to the collection.

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To add items to your collection from your library, simply drag and drop citations to place them into collections.
You can create multiple folders to organise and manage your references. A reference can be in more than one collection at a time.