Zotero provides the ability to save references from most library catalogs and databases, and regular web pages, youtube videos, etc. with one click. If Zotero detects that you're looking at a book or article on a catalog, database, or a site like Amazon.com, or the New York Times, you'll see a book or page icon appear in the address bar of your browser. Just click the icon and Zotero will automatically save the citation.
This icon will change from a book to an article page, newspaper, or other icon as you display different types of material.
If Zotero detects multiple items on a page, it will look like a folder. Click this to get a list of all the items on the page, and check off the ones you want to save.