What are the best sites for Link Building?

Link building is a work in process on TOP SEO for keywords and occupies an important role after the 3 SEO strategy, content strategy. Link building is going to create links on other websites pointing to your landing page in the same way as a link on the forum, the link in the article of friends, links in contacts, links in the bookmarks, links shared on Network social, web link from the menu in the same industry, the link from the review page website