Great resource for seo ranking information

I found a great resource which gives what factors affect seo tanking of a site

http://www.seomoz.org/article/search-ranking-factors#ranking-factors

lot of factors.

Google Trends- Insights

The image on the left shows radius,diameter on google insights and the one on right on google trends. See the correlation difference. The radius google trends line (blue) is coming down whereas diameter is flat. If you put a category filter as Math you get the left image where the correlation between radius and diameter is as expected. Comments welcome.

SEO tips for beginners

1) Internal linking on the site helps SEO
2) H1 is good -no evidence but semantic , H2, H3 so on...not of much use
3) Use meta desc but not meta keyword- easy for competitor or
automated key word detectors to steal keywords easily.
4) Key word density - not as important as most think
5) Keyword Variation- Variation of the keyword-like split phrase
or some other grammatical variation
6) Use Italic on Keyword once atleast-high correlation with ranking! -not causative so not be used excessively.-why not make all titles Italic?
7) Keyword location: Important in title and content-earlier the position the better
8) Brands matter to google- so Build the Brand