Laravel Design Patterns

Hello,

I am new to design patterns and would like to implement it to own project. I have the following application structure.

app -- Http -- Controllers ProductController.php -- Models Product -- Repositories -- Contracts ProductInterface.php ProductRepository.php 

I need your help to understand with the following.
I want to make my codes extendable like what I have to do If I want to use the Cache for my queries or want to use the Redis?

ProductInterface.php

interface ProductInterface { ... public function find($id); ... } 

ProductRepository.php

class ProductRepository implements ProductInterface { ... public function find($id) { return $this->product->find($id); } ... } 

Any example is must appreciated.