This module shows you How to add custom products grid in Magento 2 admin module.
We have created a Magento 2 module with custom database table. The module will add contact information of users. We have created a custom grid to show contacts using Magento 2 UI Component. This module adds a new table to database that will store the contact and products relationship. When you save the contact, the products attached to the contact will be updated in this table.
-Happy coding