hiz,,,!!!
does any one know about the SEO ( search engine optimization) methods, strategy ? Does our website really need to be polish by SEO optimization to Crawled, enhance and boost on top with our keywords in search engine ?

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I wouldn't say it needs to be done but it does help out alot I think the biggest thing to worry about is good content though.

Well it depends what you are looking for I guess you could say. Optimization helps boost serp position which in turn helps get traffic from search engines. So the higher you go the more traffic you should get for your work. So I say every site needs some optimization to get started.

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Optimisation... it really depends what you mean by the word. Everything you do is optimization. You make a title with the keywords in, that helps, have some nice meta tags and make sure your site has lots of content. Beyond that I wouldn't bother much.