Notice some of these blogs I have simply searched for "link building" inside their web page. There may be more information lurking inside those pages that will be great insight for link building if I were to use a different search term such as "backlink building" for example.
I think the perfect keywords with uses of phrases would worth it if we want the best sites which have high PR in google we should follow some best code and command which may direct to search engine,like this website does trust flow back links.