From Fedora Project Wiki
Contributing to Fedora can be a complex undertaking. The large number of systems to interact with on daily basis means having to check multiple different web applications to complete a task or track tickets.
Fedora Hubs is to provide a communication and collaboration centre for Fedora contributors of all types. Current contributors visit Hubs to check on their involvements across Fedora, discover new places that they can contribute. For new contributors, Hubs is a place to get started collaborating with others.