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There are 2 ways to load / retrieve product information.  This blog explains how to load product by id in magento 2 using both Objectmanager & Factory method. 

How To Load Product By Id In Magento 2?

How to Modify Magento 2 Database Configuration file

How to Override Magento 2 Helper, Block, Model and Controller

How To Load Product By ID In Magento 2?

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