HOW TO LINK PRODUCTS TO CATEGORIES IN MAGENTO 2 PROGRAMMATICALLY

Magento 2 provides inbuilt functionality to assign and remove products from the category under Magento 2 admin > Products > Categories section. However, there are situations when we need to dynamically assign and remove products from a category. In this article we will show you how to link products to categories in Magento 2 programmatically

1. Adding products to category:

To ensure that you have all the data needed for the code, you will have to get the category ID that you want to add to the product and the product ID of that product.

For example, we will add any product to the “Wine” category after saving the product.

Note: You can get category ID from Catalog > Categories

Source: https://magenest.com/en/how-to-link-products-to-categories-in-magento-2-programmatically/