Zotero PDF Reader and Note editor
You can now use Zotero to create annotations:
1. Open your article in your PDF reader.
2. Highlight the text you are interested in and choose a color: 
3. Toggle to the Notes View 
4. Click on the "plus" symbol to "Add Item Note from Annotations" 
5. Your quote will appear in Notes View. You can add your annotation or notes below:
Adding items by ISBN
Have the book in front of you and want to add it to your Zotero library without having to search for a citation?
If you have a book's ISBN, an online article's DOI or PMID number, just click the magic wand button: "Add item by identifier." Type in the book or article's number, and Zotero will automatically download its information and save it to your library.
Zotero + EndNote
EndNote and Zotero can both read and write a standard citation file format called RIS, which means references can be converted back and forth with a few clicks.
PDFs and other attachments do not export between programs, however; only citation information.
Zotero to EndNote
To save your Zotero library for importing into EndNote, click the "File" menu and choose "Export Library." Choose RIS as the file type and pick a filename.
In EndNote, click "File" and then "Import." Click the "Choose File" button and select the file you just exported from Zotero. Set Import Option to "Reference Manager (RIS)" and click Import.
EndNote to Zotero
To export your EndNote library for use in Zotero, click "File" and then "Export." Set the output style to "RefMan (RIS) Export" and save it as a text file.
In Zotero, "File" and then "Import." Just double-click the file you exported from EndNote. The new references will be added to a new collection.
