The factors like keyword focus on anchor text from links, link popularity, diversity in link sources and trustworthiness of the domain address for which you are posting your link. All this factors play a major role in site promotion and marketing. Furthermore, concealing the links with malicious intention, links purchased from known seller or brokers, links to low page ranking sites, hiding the links by user agent and the inaccessibility show negative impact on link building and can affect ones page rank.
As link building is the fundamental step of Search Engine Optimization - SEO, it is essential to know the fundamentals of link building. The development of link building should be in a strategic way. The first and foremost thing is the quality of links which are in regards to the search engine guidelines. Links like reciprocal links, directory links etc. should be natural or else they will be tripped by a search engine filter. Giving an initial analysis of website regarding the content and the back links to the site are useful.
Moreover the links used in link building should be effective and match with the content so that it can achieve higher rankings in search engines. If the links are not relevant the user may be banned by the search engines. Few people think that the easiest and fastest way to get popularity is paid links without being aware that it runs the risk of getting major penalty. Also if the website or blog is identified by the search engines as a link buyer they have the right to penalize them and they will be banned from search engine or their race for being in the top will be stopped for months. Consequently, it is better to take care of certain factors in place of spending your money on risky paid links.