PHP ?

[dcgiann]

What is PHP and how is it used? Can one market it (the idea) of support on the internet?

[almostbob]

the first part of your question negates the possibility of your accomplishing the second part

PHP is a script language, a server language that enables web pages to be dynamic, to generate content in response to user actions, in its simplest incarnation
less simple incarnations its my booking site
in more complex incarnations it is PayPal Hotels.com kijiji ebay acer
it is free software so every pimpled schoolkid can write it
for support, you are about ten years, and several hundred dozen good programmers, too late
look at www.php.net for information
and google php support to see what you're up against

http://www.w3schools.com/php/default.asp

You start here, well structured for beginners and you can move for other technologies from here itself.