Group releases and roadmap milestones that belong to the same product or initiative.
If you ship more than one product, or one product with distinct areas like Web, iOS, and API, projects let you keep their updates separate while managing everything in a single workspace.
Visitors can filter your releases and roadmap by project on your public page, so someone who only cares about your API updates can narrow the feed to just those.
Use projects for which product this belongs to and labels for what kind of change this is (feature, fix, improvement). They work well together.