write a code to fill a form on the web and read one of the elements

I am periodically checking a website which requires me to fill a form. When I fill the form, a window pops up which includes the information I am looking for.

I was wondering if there is a way to write a program to fill the form and extract the fields that are of importance to me.

If yes, What language is easier for doing so?

Is there any way to read one of the elements on the window that pops up? (When you right-clik on an item and select inspect element)

Could you please provide links and tutorials to implement this, so that I could write the program ASAP?