"Zotero groups provide a powerful way to share collections with a class, work closely with colleagues on a project, keep track of conversations in your field more broadly, and keep tabs on what people at your institution or in your department are working on. There is no limit on how many members may join your groups, and your full storage subscription is always available to your personal and group libraries." ~ from the Zotero website
Follow the 5 steps below to set up a new Zotero Group folder: