5 new ranking signals in SEO best Practices this year

The 5 new ranking signals that Google has rolled out this year  which webmaster needs  to ensure are

1) Content Content and only Content 2) Social Validation of your website and   how popular your website is socially 3) how secure is your website 4) Mobile  Ranking  Signal which means how friendly your site is across mobile web 5) Knowledge Graph and Semantic web: How is your website viewed across the semantic web (  Latent semantic Indexing is becoming all the more important as  Google tries to provide answers to queries like " which movie is playing at  my location ? or  which airlines has  fare below  peak rate ?