Empty list with one action
A project list with nothing in it yet: one sentence on what is missing and the action that adds the first project, which then takes the place of the empty slot.
Empty states
Search with no results
A people list whose search and role filter match nobody, saying what is applied and how to get everyone back with Clear filters.
Block that failed to load
A page of cards where one block failed (simulated) and shows a notice with Retry, while the other cards keep working.