Hi, I am just starting web design, and wondering whether HTML and XML is the only web site programming languages. If so which one is better for professional web sites? If not, what other web site languages are there, and which has the best qualities?
HTML is what a webpage is composed of. It can be delivered to a browser in static form or be created through the use of server-side languages such as php, asp, coldfusion, perl, .....
You should study HTML.