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There are few things you can verify.

1) referrers, An empty referrer is an indication that, a legit user hitting the page by entering the url in address bar. But Mostly bots dont use referrers to...

No, Sitemap may not have direct relationship with traffic or rankings. However they are quite helpful for the crawlers know about your pages. It helps faster crawling.

Use the sitemap section in...

I would advise you to start with VB. Use visual studio to learn by yourself. Then read some books. It will sure help you to keep going.

Yes I have used the q&A section of the forums and also Sites like stackoverflow. Very high traffic