In SEO terms, PBN is a network of websites that host numerous links to other websites. These links are low-quality ones designed to manipulate search engine rankings. I wouldn't build such backlinks. They aren't just low-quality links, but may even harm your website. This is a black-hat link-building technique. If you want quality backlinks, I'd suggest contacting crowdmark.net. It is a crowd marketing agency. They have built me over a hundred high-quality backlinks and since starting working with crowdmak, my traffic has doubled.