Link strength is more dependent on the authority of the linking domain rather than its PageRank alone. Government (.gov) and educational (.edu) domains are highly authoritative even if they have a low PageRank, as they are run by trusted authorities. To build strong backlinks, one should focus on commenting on relevant government and educational blogs to earn links from these authoritative domains. Establishing deep backlinks from such trusted sources helps boost the authority of inner pages on a website and regains link balance if prior efforts focused only on the homepage.