search engine optimization is the process of affecting online visbility of websites in search engines results pages.Promoting a site to increase the number of backlinks or inbound links is also an seo strategy.
Google has develop the Search Algorithm to find the relevant search results to its website users. There are many parameters in its search algorithms that impacts the search engine results.
Google uses automated programs called spiders or crawlers, just like most search engines. Also like other search engines, Google has a large index of keywords and where those words can be found.
Header tags are an important on-page SEO factor because they're used to communicate to the search engines what your website is about.This starts with your h1 and works its way down in importance to the h2, h3 and so on.
With Google Analytics you can track website traffic sources. With Google analytics report you get traffic sources report which you can track different traffic sources.
Keyword Density still plays a good role in search engine optimization although its importance has decreased over the years as search engine algorithms have advance but still its plays a role in website optimization.