Create Meta Descriptions for everything

I have a woocommerce shop and a blog on my site. I would like to create meta descriptions for everything, the products, the product categories and also the posts (and a few pages). What would be the setting in the manual content edit tab? I cannot get it to create descriptions for the products and product categories, I have not found a way to mass select those and producct tags don't count as regular tags, so it is not possible doing it that way. Could you please help me with that?