unlimited backlinks generation and blog commenting activity and so on.
I will suggest better to go Internet you will get proper information in detail format.
All the techniques which do not follow search engine guidelines to promote their website are black hat seo techniques and google may penalize website to perform such techniques.
Black hat SEO is a disapproved practice that increases website's ranking in a SERP. This is not a good seo technique because it can cause the site for being banned from the search engine.