HTML, CSS, MySQL, with a dash of PHP to hold it all together.
... I remember when I only needed to know one language to write a program. Now I'm familiar 10+
(It annoys me so much that I have to know 4-6 languages just to get started on something.
Hats off to all you other long time programmers who toughed it out, and learn the new languages to keep up with the times.