Do you know what is a backlink?
Backlinks is a term that refers to all the links that point to any website, so after accomplishing the task of creating a website, you have the problem of the SEO tools to have good positions on search engines, among these tools used : backlinks!
The principle is that the more a site has links from other websites, it is more interesting and can be used as a good reference.
So, you must have knowledge of techniques for obtaining links to improve the positioning of your website.
Get backlink must follow certain rules to avoid the maximum punishment from search engines, to increase backlinks, you should specifically get links from websites that have the same domain and the same specialty, you must register in directories, even in the search engines.
Luckily, you have a strong possibility to get more quality links, you can deploy the forum as a tool for obtaining backlinks, leaving a signature on messages posted, but you must choose the forum which allows to leave a signature, because of some that erase all memories of their publications and responses contains links to an external website.
Another thing that you should keep it a head, having links to other websites which have a different specialty than you ,may expose your site to a punishment of search engines (sandbox a blacklist), even having backlinks which are bad quality may affect site positioning on search engine results.
Several tools can help you to know the number of backlinks,for exemple: www.woorank.com