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Does Submitting URLs to Bing and Google actually do anything? Is it worthwhile? What I mean is submitting intermittently individual URLS after already submitting the sitemap.

I am kind of new to all this but I would like to understand canonicalization. I have a website which when you arrive on it is www.mysite.com but once inside and flicking back to the homepage it reverts to www.mysite.com/index.html. Should I be doing something re canonicalization? If so what? Will the link juice be diluted by having two home page versions? Thanks