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One advanced Laravel tip is to create custom Eloquent Collections. Instead of manually processing arrays of models in controllers or services, you can encapsulate common logic directly within a custom collection class. To do this, override the newCollection method in your model to return an instance of your custom collection. Then, add domain-specific methods (like filtering active records, transforming data, etc.) to that class. This approach keeps your code DRY, makes your query logic more expressive, and centralizes common data manipulations for improved maintainability.