A focus is a project that normally takes more time and likely includes multiple people and/or teams. Currently, focuses for design revolve around release roadmap posts and their subsequent projects, alongside scoping out Phase 3 efforts.
Design Priorities Projects
There are a range of project boards you can use to look at priorities in the editor:
If in doubt ever about a priority or what you should do, reach out in #design on Slack and someone will happily help direct you.