Zotero is a free, open source bibliographic management tool. It works with a desktop app and a browser extension. Use the browser extension (best in Firefox or Chrome) to save sources that you find online to collections in the Zotero app. Juris-M is an adaptation of Zotero that improves how sources are saved for legal information, especially primary sources from platforms like Westlaw and Lexis. This guide is an introduction to using Zotero/Juris-M for legal research: https://libguides.wvu.edu/law/zotero.
WVU Libraries prepared a video series demonstrating basic use of Zotero. This introduction is directly transferrable to using the Zotero derivative, Juris-M.