Zotero is a popular free open source citation management tool that makes saving and citing online resources, including websites, YouTube videos, news articles, and scholarly database results, a breeze. Some of Zotero's strengths include its ability to capture a multitude of resource types with the click of a button, and its group library function, with no limit on group membership. For more about Zotero, see this guide.
ZoteroBib is a free, quick, and easy bibliography and citation maker that saves time and trouble.
Add sources using the ZoteroBib search box. Then, copy and paste the complete bibliography (or footnotes or in-text citations) into your paper in the citation style of your choice.
Syncing your library means backing up your citations on Zoter's server. This way you can access your citation remotly and retrieve them if something happens to your personal computer.
This arrow will appear in your Zotero library. It will spin when it is uploading your citations.
If you're regularly using more than one computer in your research, Zotero's sync feature can keep your library up to date on all of them. Zotero can store a copy of your library on the Zotero.org server and check it for updates whenever you open your library on a different computer. All your computers must be running the same version Zotero and be configured to sync to the server.
For more details and help troubleshooting sync problems, check the Zotero site.