SEO Question

What is robot.txt?

Importance of H1, H2, H3 tags.

Prominence: relative importance , The general location of a keyword or phrase in relation to the overall text on that page.

Proximity : how close keywords are to each other on web pages.

Content on a page

Keyword Density:
LSi : The process of analyzing the relationships between terms in sets of documents.
W3 Validation
Web2.0 and 3.0
web 2.0 is using css, tableless and cms, web interactive, using things like video, web casts, pod casts, live chat customer-service, rss feeds, social bookmarking, etc.

"The intelligent Web"

Web3.0

Semantic Web transforming the way the Web is used (and leading to new possibilities in artificial intelligence) to the observation that increases in Internet connection speeds

semantic web, microformats, natural language search, data mining, machine learning, recommendation agents, and artificial intelligence technologies

Difference between PageRank and Toolbar PageRank

both the toolbar and the directory visible PageRank is just a number or graphic representation of the Real PageRank. It is the real PageRank that is a factor that is used to determine Google's order of results in all their search engines searches, not toolbar displayed PR. What we see on the toolbar and in the directory is derived from this real PageRank.

PR calculation

PR(A)= 1 - d + d (PR(B)/L(B)+PR(C)/L(c)+PR(D)/L(D)+.......................)

PR(Pi)=(1-d)/N + d Sum(PR(Pi)/L(Pj))

Segmentation
Google webmaster tool
Difference between html and xml sitemap.
RSS
Dynamic site optimization
ranks.nl/tools/spider.html