This video shows how to install Zotero 7 on Windows, and how to add connectors in Chrome, Firefox, and Edge.
These excellent videos were made by York librarian Kris Joseph as part of the Mastering Zotero course. They were made in 2020, using version 5 of Zotero, which is now at version 7. The interface looks different, but the principles are the same. There are many excellent practices to be learned from these videos.