React Key Prop Warning in Lists

1. No key prop on list items
2. Using index as key (breaks when list reorders)
3. Key not unique across siblings
4. Key changes on re-render
5. Using Math.random() for key generation

Use unique, stable identifiers as keys:

// Bad - using index
{items.map((item, index) => 
  
{item.name}
)}

// Good - using unique ID
{items.map((item) => 
  
{item.name}
)}

// Good - using combination if no ID
{items.map((item) => 
  
{item.name}
)}