For documentation on managing products, please visit https://docs.woocommerce.com/document/managing-products/

On the products list view, you can bulk edit multiple products at a time. 

Select the products you want to bulk edit and click on 'Bulk Actions'>'Edit' then 'Apply'

Once you have made your edits, click on the 'Update' button in the bottom right corner to apply the changes. The screen will revert back to the normal list view.