How to add Google Analystic Code in a Site?

I want know How can I add Google Analytics code on site? I need to have add that code on every page or only just home page. Informative answers will be appreciated.

For adding code you have to copy and paste this code into the bottom of the content,right away before the </body> tag of each page you are planning to track.If you use a common include or template, you can enter it there.

you can add it only on home page.it is easy to put on your page you have to just copy and pate to the content