Are you referring to .edu backlinks? If you want to make links that point back to your site, it depends on the context and relevancy. Links aren't the main goal; they're a way to achieve something else. Surely, getting a link from a government or educational website can be good, but it might not be worth it if not relevant. For ecommerce sites it is not relevant until the site sell learning materials so don't worry there are lots of other good websites out there that can help you reach your goals for improving your site's visibility.