How does SEO works?

SEO is all about making the search engines trust a website, in essence, the more a search engine trusts and likes a site, the higher it will place it in the search results. Gaining trust is achieved by building up momentum from making websites as search engine friendly as possible, and carrying out other SEO work such as writing and publishing new content, building new links from related websites and making on-site changes to code and on-page content.

Over time, search engines will see an increase in positive activity, this creates a snowball effect, which should cause the site to start moving up the search results, by keeping up this momentum the site should continue to keep moving up the rankings.