4.4 State exploration (empty, error, loading)

I’m working on a project about [describe your domain/product/idea]. I want to design state variations for key wireframes. Can you help me with: 1. Listing essential states (empty, loading, error, success). 2. Giving examples of how each state could look/behave. 3. Highlighting UX best practices for state handling. 4. Suggesting how to keep state designs lightweight at wireframe level. Format as a state matrix I can reference.