Google analyze your site, and you should change it according to the advises there. Try: http://www.google.com/webmasters/tools/, submit your site, and see the analyzes there.
this is basically for testing the conversion of your site to see how your site is optimized for conversion. not intended for seo purposes. if you are an adwords advertiser, then you must get an understanding on how your site will convert. before you spend money on advertising, you test it to see whether your site is optimized enough or you will need to work on it.
Its good to give it a try. Its will increase conversion is you have sites where you sell things, or want people to signup for something. You can also try reedge.com its easier.
If I make a sit and I want to earn from it then what I would have to do?? can anyone tell me, please!!
Google Optimizer is a free product from Google that allows you to run multivariate tests of your website. All you need is a Google account. Using the website optimizer in and of itself will not affect your Google search engine rankings
though you should not totally rely on it but you can have it as a try to take some good advice or suggesstions that may work someday or the other.
Google website optimiser is a set of suggestions for your site by Google for better rankings and quality. Though it might not always work, but it is a great way to analyse your site and have an evaluation from the Google automated system.
Google website optimiser is one of Google's free tools that can help you improve your site business performance by means of testing. The main advantage of GWO is that it is free and from Google. But if you need a more robust tool, consider using http://personyze.com and enjoy from a tool that includes in one integrated platform a full analytics solution, visitor segmentation, site personalization and testing. So you can identify a problematic metric in your site (using the anlytics), immediately define a segment for it and associate a few personalization actions and then test which action achieved the best result. So you are doing testing, but in a smart and laser focused way, rather then doing testing on all your visitors like with GWO. HTH.