Linkbuilding uses both unpaid and paid ways to create backlinks to increase the value and attendance of pages. Among the unpaid methods are registration to catalogs or exchange of links with operators of thematically similar pages.
Linkbuilding can also use various discussions or forums on the Internet to facilitate the exchange of links. It is good for search engines not to recognize that these are exchange-linked links. This is done most often so that the pages refer to a user site other than the site from which the backreference originates.
Indirect linkbuilding is done through the creation of information websites, so-called minisites, writing blogs, contributing to discussions and forums, and other ways. For commercial sites, it's easier to find backlinks by indirect means.