Magento 2 is a robust CMS platform that facilitates providing best-in-class shopping experience to their shoppers and grow their eCommerce stores exponentially.
Such a platform provides easy customization facility such as implementing category-specific features and can be done with the help of programmatic methods to get parent category ID in Magento 2.
You can easily get parent category ID in Magento 2 using the block file or PHTML file method. One such example is either show the name or image of a parent category from its subcategory. It is even possible to impose shopping restrictions depending on a particular category.
Here, I have prepared a tutorial that will provide you with the complete information at: https://meetanshi.com/blog/get-parent-category-id-in-magento-2/