Zotero is an amazing tool for researchers. With Zotero, you can:
At the Zotero site, click on the red "Download" box.
You will need to download both Zotero and the Zotero connector.
(Zotero works with Firefox, Chrome, Edge, and Safari browsers.)
If you don't have many citations to manage, you may not need all of Zotero's features. You should try ZoteroBib.
ZoteroBib allows you to create bibliographies quickly and easily. No downloading of software or creating an account required.