You must have to analyse opencart database structure before you starting OC tutorial. As open cart is best MVC structure which gives all the flexibility to access tables and create separate modules.
Once you will familiar with the product table structure you can make your won functionality to get the magic comes out of it.
Here is a PNG for DB structure analysis.
He wants is an internet computer, https://www.affordable-papers.net/ a good word processor, an evidence writing applications and a couple of minutes, and a copy of the finished essay.