The Google SEO algorithm is based on mainly the keywords of the contents. There could be millions of results just for a keyword. However, you have to choose the exact and specific keyword to appear on the top of the search pages so that Google will show you to the users which are the most relevant. The Google SEO algorithm is not a one-way thing it is consisted of multiple algorithms to highlight the most relevant ones. Since that, you have to be specific about the head titles, the advertisements, the structure, etc. of your website.