Top Five SEO Factors

There are "over 200 SEO factors" that Google uses to rank pages in the Google search results (SERPs). What are the search engine optimization rules?
Here is the speculation - educated guesses by SEO webmasters on top webmaster forums. Should you wish to achieve a high ranking, the various confirmed and suspected Google Search Engine Optimization (SEO) Rules are listed below.

POSITIVE ON-Page SEO Factors	Brief Note
KEYWORDS	Google patent - Topic extraction For keyword selection, try Google Ad Words - Google Trends
Keyword in URL	First word is best, second is second best, etc.
Keyword in Domain name	Same as in page-name-with-hyphens
Keywords - Header
Keyword in Title tag	Keyword in Title tag - close to beginning Title tag 10 - 60 characters, no special characters.
Keyword in Description meta tag	Shows theme - less than 200 chars. Google no longer "relies" upon this tag, but will often use it.
Keyword in Keyword metatag	Shows theme - less than 10 words. Every word in this tag MUST appear somewhere in the body text. If not, it can be penalized for irrelevance. No single word should appear more than five time. If not, it may be considered spam. Google purportedly no longer uses this tag, but others do.