Vue 3 debugging and error handling for runtime issues, warnings, async failures, and hydration bugs. For development best practices and common gotchas, use . Reactivity - Tracing unexpected re-renders and state updates → See reactivity-debugging-hooks - Ref values not updating due to missing .value access → See ref-value-access - State stops updating after destructuring reactive objects → See reactive-destructuring - Refs inside arrays, Maps, or Sets not unwrapping → See refs-in-collections-need-value - Nested refs rendering as [object Object] in templates → See template-ref-unwrapping-top-le…