Links from PBN
The main problem when building a link mass is finding quality donors. The problem is that the large number of automated exchanges has prompted webmasters to massively create low-quality websites whose main purpose is to sell links.
Creating PBN
Everyone knows that SEO is the most effective way to promote websites in search engines. Buying links is also not a problem: there are dozens of automatic exchanges. The only catch is that link building, even if done by a competent optimizer