Blog Content = Standard blog article.
Long-Form Content = Higher quality articles. Usually longer and more researched than a standard blog article.
Company Homepage = Choose this when building links to the homepage of a software business, ecommerce site or national site.
Company Service Page = Choose this when building links to a service page of a national site or features page.
Ecommerce Product Page = Self explanatory.
Local Business Homepage = Self explanatory.
Local Business Service Page = Self explanatory.