Factor that affects google search engine ranking

Domain

1) Domain age.

2) Exact Match Domain.

3) Country TLD extension.

4) Sitemap

5) Contact Us

6) Site navigation

7) Related quality back links from high authority site.

Page 

1) Key words in title tag.

2) Key words in description tag.

3) Key words in heading H1 (Use only once in one page)

4) Article Content ( recommended: 500+ words)

5) Article key words density (2.5-5%)

6) Page Loading speed ( 0.5-1 sec/ 1 mb)

7) Latent Semantic Indexing Key words ( e.g Best Hair Gel = Good/Top Styling Gel/Wax )

8) Duplicate Content.

9) Image Optimization.

10) Content Updating (daily/weekly)

11) Grammar & Spelling.

12) Outbound Link Quality. 

13) Quality/numbers of internal links.

14) Broken Links.

15) Reading Level.

16) Affiliate Links. (If too many)

17) SEO like numbering listing format in the article.
18) Image indexing description (alt="i love xxvmon")

Traffic

1) Organic click through rate will increase serp.

2) High bounce rate is not very good.

3) Direct Human Traffic will influence serp. (Bot traffic doesn't affect serp)

4) Interaction (Number Of Comments)

5) Users browsing history/bookmark.

Social

1) Number of tweets from high authority twitter users accounts.

2) Facebook likes doesn't affect much because it cannot be detected.

3) Facebook shares influence ranking because they function as backlinks.

4) Pinterest.