i want know major difference b/w post and get method.

Post: http://www.w3schools.com/php/php_post.asp
Get :http://www.w3schools.com/php/php_get.asp

Hope it helps.

POST sends data through the body of the request and GET data is passed through the URI

I suggest you always pass form data through to the server via a POST as this data is potentially unlimited regarding size and is more secure where as a GET is limited due to address bar length limitations