Zotero is a tool that collects, manages, and cites research sources. Zotero is available on the PCs in the Information Commons, and you can download it for free at their website.
Zotero allows you to attach PDFs, notes and images to your citations, organize them into collections for different projects, and create bibliographies.
To get started using Zotero, check out their Quick Start Guide, or look through some of these excellent guides from other libraries:
There are also lots of Zotero tutorials on YouTube.