Analytics code can be applied to all pages in a website? Yes I want to analyze every pages..Than put all code to EVERY page. hould i add the webmaster tracking code to every pages as well? Yes added webmaster tracking code to landing page only...this will track your langing pages.
You can also verify your Webmaster Tools account by using your Google Analytics account, that way you don't need to add any further code or upload any files.
As was mentioned, if you use the async version of the GA code now you can place that at the top of the page as it loads independently of the content, it used to be placed at the bottom, in case it stalled the page loading.