Sometimes when you need to move products from one category to another you have to go from one product page to another, edit categories, save and repeat.
Not a big deal when you have to update 10 products. However, for a larger scope businesses, it can take hours considering the number of products they have.
To simplify this process you can just use Magento 2 Product Grid Inline Editor and edit categories directly from the product grid.
If you need to update multiple products at once you can bulk update categories via the mass actions option. In this article though, you will learn how to edit categories from grid in Magento 2.