In addition to storing bibliographic information, Zotero can save links to full text, attachments, tags for organizing your content, snapshots of pages, notes about the items, and stand-alone notes.
Tags
Tags from databases are added automatically when you import articles. You can also add new tags, edit existing ones, delete tags, etc. All tags are shown in the bottom of the left column of your Zotero home, and the tags for each item are also shown in the item details when the item is selected. If you don't want to import tags with items, go to Edit > Preferences > General and uncheck "Automatically tag items with keywords and subject headings."
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Notes
To create a note attached to an item, select the item from the list in the center and either click "New Note" at the top of the center column and select "Add Child Note," or go to the "Notes" tag in the right-hand column and click "Add."
Sometimes Zotero will automatically import information from a resource, such as a table of contents or abstract, into the notes.
Standalone Notes are not attached to a particular item. To create a standalone note, click "New Note" and select "New Standalone Note."
Attachments
You can set your Zotero preferences to import pdfs (if available).
Go to Preferences > File Handling and check where it says "Automatically attach associated PDFs and other files when saving items." You can also retrieve metadata and take snapshots, or rename attachments.