Google Top Ranking Signals
 

I recently read from a search data that Google announced RankBrain as its third most ranking signal. Lipattsev; a Google's Search Quality Senior Strategist also announced links and content as the two most crucial ranking signals in its search algorithm. What are the current top three ranking signals in Google's search algorithm in 2018?

Content
Backlinks
Technical Factors
Page Speed
Conclusion

It has never been more important to keep up with changes in Google Search's ranking algorithm - check out the current top 9 Google ranking factors.

Robots.txt is a text (not html) file you put on your site to tell search robots which pages you would like them not to visit. Robots.txt is by no means mandatory for search engines but generally search engines obey what they are asked not to do. It is important to clarify that robots.txt is not a way from preventing search engines from crawling your site and the fact that you put a robots.txt file is something like putting a note "Please, do not enter" on an unlocked door – e.g. you cannot prevent thieves from coming in but the good guys will not open to door and enter. That is why we say that if you have really sensitive data, it is to rely on robots.txt to protect it from being indexed and displayed in search results.

These terms are really very important for Google ranking factors :

1. Page Titles
2. Keywords
3. ALT Tags
4. Sitemaps
5. Mobile Site
6. Don’t Use Flash
7. Update Content Regularly
8. URL Structure
9. Grow Natural Links
10. Monitor your Progress

I agree with above comments

Google has many ranking factors, to rank the website. it may happen from search engine algorithms to hurting websites while violence search engine guidelines.