To install Zotero you will install Zotero Standalone and a browser connector (Chrome, Firefox). Zotero does not work with Internet Explorer and there are current issues with Safari 13 (the new release).
Each Zotero account comes with 300 megabytes of file storage for storing citation information, PDFs, notes, etc. If necessary, you can purchase additional storage from Zotero.
An online tool, AnyStyle can be used to extract bibliographic references from documents in 3 simple steps:
Have a Chromebook?
Zotero can be run from a USB or external hard drive using portable apps. Instructions available on GitHub. This option can also be used with a public computer.
Use a mobile device or tablet?
Use Zotero on your mobile device using Bookmarklet. It will save items directly to your zotero.org account.