Zotero is available for macOS, Windows, Linux, iOS, and iPadOS. If you're on a Chomebook you can use zBib instead. It's browser-based and should work anywhere.
In addition to Zotero itself, you will need the Zotero connector for whichever browser you use. Connectors are available for Chrome, Safari, Firefox, and Opera.
If you have a Chromebook, an Android device, or don't want to install a program, you can still get many of the benefits of Zotero by using ZBib. Zbib allows you to make a bibliography in any style by adding the URL of your item. It won't help with in-text citations, but it still saves a lot of time!
Zbib is a citation generator, but it's better than things like EasyBib. It has over 9,000 styles and will save your citations so you can create an entire bibliography!
Exercise 1: Add a PDF into Zotero [GoogleDoc]
Exercise 2: Shortcut Citing & Citation Review [GoogleDoc]
Exercise 3: Using the Zotero Web Importer [GoogleDoc]
Exercise 4: MSWord or GoogleDocs: Writing and Citing [GoogleDoc]