What's the correct way to use 'unless' in Liquid? 🚫

### Explanation The `unless` tag is a negative conditional in Liquid: ```liquid {% unless product.available %} This product is sold out {% endunless %} ``` Key points: - `unless` executes when condition is false - Cleaner than using `if` with negative condition - Cannot use `else if` with `unless` - Can use `else`: ```liquid {% unless customer %} Please log in {% else %} Welcome back! {% endunless %} ``` - Best practices: - Use for simple negative conditions - Use `if` for complex logic - Keep blocks short and readable Reference: [Shopify Control Flow](https://shopify.dev/docs/api/liquid/tags/control-flow)