How do I create these types of links?

I found an interesting link profile. They have a lot of pages they have created on .edu sites. The content looks pretty natural on the site. I can't post a link to the page but I am interested in learning how to do this or if someone has a service that can take care of this for me. This is my first post be easy.
Thanks

if those backlinks are on blogs = Scrapebox
if those backlinks are on forums = xRumer