11. Keyword in Title Tag
The title tag is a webpage’s second most important piece of content (besides the content of the page) and therefore sends a strong on-page SEO signal.
12. Title Tag Starts with Keyword
According to SEOMoz data, title tags that starts with a keyword tend to perform better than title tags with the keyword towards the end of the tag.
13. Keyword in Description Tag
Another important relevancy signal.
14. Keyword Appears in H1 Tag
H1 tags are a “second title tag” that sends another relevancy signal to Google, according to results from this correlation study.
15. Keyword is Most Frequently Used Phrase in Document:
Having a keyword appear more than any other likely acts as a relevancy signal.
16. Content Length
Content with more words can cover a wider breadth and are likely preferred to shorter superficial articles. Microsite Masters found that content length correlated with SERP position.
17. Keyword Density
Although not as important as it once was, keyword density is still something Google uses to determine the topic of a webpage. But going overboard can hurt you.
18. Latent Semantic Indexing Keywords in Content (LSI)
LSI keywords help search engines extract meaning from words with more than one meaning (Apple the computer company vs. the fruit). The presence/absence of LSI probably also acts as a content quality signal.
19. LSI Keywords in Title and Description Tags
As with webpage content, LSI keywords in page meta tags probably help Google discern between synonyms. May also act as a relevancy signal.
20. Page Loading Speed via HTML
Both Google and Bing use page loading speed as a ranking factor. Search engine spiders can estimate your site speed fairy accurately based on a page’s code and filesize.
21. Duplicate Content
Identical content on the same site (even slightly modified) can negatively influence a site’s search engine visibility.
When used properly , use of this tag may prevent Google from considering pages duplicate content .
23. Page Loading Speed via Chrome
Google may also use Chrome user data to get a better handle on a page’s loading time as this takes into account server speed, CDN usage and other non HTML-related site speed signals.
24. Image Optimization
Images on-page send search engines important relevancy signals through their file name, alt text, title, description and caption.
25. Recency of Content Updates
Google Caffeine update favors recently updated content, especially for time-sensitive searches. Highlighting this factor’s importance, Google shows the date of a page’s last update for certain pages: