GOOGLE SEO RANKING FACTORS 2018:
1:Main Keyword in Post Title
2:Keyword in Domain Name
3:Age of Domain
4:Keyword in H1 and H2 Tags
5:Content Length
6:Update Content Regularly
7:Keyword Density as Low as Possible
8:Use Images in Articles
9:Add Videos in Articles
10:Website Page Loading Speed
11:Mobile Optimized
12:Domain Authority
13:W3 Validation
14:Submit Your Website Sitemap to Google
15:Be Penguin Safe
16:Create Relevant Backlinks
17:Avoid Duplicate Content
18:Social Media Shares
19:Provide more useful content
20:Positive Feedback from audience
credit:
http://www.bloggerus.com/2017/11/top-20-google-seo-ranking-factors-in.html