The following Icons are being used by Zotero (application) to explain different functionalities and applications:
From left to right:

- The icon is to create a new collection/folder or sub-collection within a My Library or a subfolder with a Group Library
- NOTE: Create Group library folders on the Zotero site (see Group tab on left)

- The first icon allows you to create a reference/citation manually (many options)
- The wand icon allows you to enter a standard number (e.g. ISBN, DOI) and have Zotero find/import reference
- The third icon allows you to attach a file (e.g. article PDF) to any reference
- The note icon allows you to add a new note to any reference
NOTE: There is also a Search box on the toolbar that searches your Zotero Library. Select "Everything" to even search the PDFs.