Google's most important SEO factors
https://goodlifetraveller.blogspot.kr/2018/03/googles-most-important-seo-factors.html
If you are interested in Search Engine Optimization(SEO) especially at Google, please check, it explains the most important to 10 factors.
Three most powerful SEO strategies in Google.
Authority, trust & relevance.
Three powerful SEO strategies explained.
It is said that Google once considered over 200 factors to determine which sites rank higher in the results.
It means that Google has more than 200 factors to check the sites.
Google assesses how many links are pointing to your site, how trustworthy these linking sites are, how many social mentions your brand has, how relevant your page is, how old your site is, how fast your site loads… and the list goes on.
Google’s algorithm is quite complex, but we don’t have to be a scientist to understand how it works perfectly. There are three principles, these three principles summarize what Google are focusing on in their algorithm now, and are the most powerful
strategies SEO.
The three key principles are: Trust, Authority and Relevance.
Trust.
Trust is at the very core of Google’s major changes and updates the past several years. Google wants to keep poor-quality, untrustworthy sites out of the search results, and keep high quality, legit sites at the top. If your site has high-quality contents and backlinks from reputable sources, your site is more likely to be considered a trustworthy source, and more likely to rank higher in the search results.
Authority
Previously the most popular SEO strategy, authority is still powerful, but now best used in tandem with the other two principles. Authority is your site’s overall strength in your market. Authority is almost a numbers game, for example: if your site has one thousand social media followers and backlinks, and your competitors only have fifty social media followers and backlinks, you’re probably going to rank higher.
Relevance.
Google looks at the contextual relevance of a site and rewards relevant sites with higher rankings. This levels the playing field a bit, and might explain why a niche site or local business can often rank higher than a Wikipedia article. You can use this to your advantage by bulking out the content of your site with relevant content and use the on-page SEO techniques described in later chapters to give Google a nudge to see that your site is relevant to your market. You can rank higher with less links by focusing on building links from relevant sites. Increasing relevance like this is a powerful strategy and can lead to high rankings in competitive areas.
Google’s top ranking factors;
If your competitors’ have more of the above features than yours, then it’s likely they will rank higher than you. If you have more of the above features than competitors, then it is likely you will rank
higher than your competitors.
Combine this knowledge with an understanding of the recent Google updates covered in later sections, and you will know what it takes to achieve top rankings.
The above factors are from the Search Metrics Google Ranking
Factors study released in 2015. The Search Metrics study is an in depth look at the high-ranking factors in Google.