Even if plenty of backlinks come to your site the natural way, additional quality backlinks are always welcome and the time you spend building them is not wasted. Among the acceptable ways of link building are getting listed in directories, posting in forums, blogs and article directories. The unacceptable ways include inter-linking (linking from one site to another site, which is owned by the same owner or exists mainly for the purpose to be a link farm), linking to spam sites or sites that host any kind of illegal content, purchasing links in bulk, linking to link farms, etc.
The first step in building backlinks is to find the places from which you can get quality backlinks. A valuable assistant in this process is the Backlink Builder tool. When you enter the keywords of your choice, the Backlink Builder tool gives you a list of sites where you can post an article, message, posting, or simply a backlink to your site. After you have the list of potential backlink partners, it is up to you to visit each of the sites and post your content with the backlink to your site in it.
You might wonder why sites as those, listed by the Backlink Builder tool provide such a precious asset as backlinks for free. The answer is simple – they need content for their site. When you post an article, or submit a link to your site, you do not get paid for this. You provide them for free with something they need – content – and in return they also provide you for free with something you need – quality backlinks. It is a free trade, as long as the sites you post your content or links are respected and you don't post fake links or content