Classic BASIC is very simple to program with, and your code will run on almost any computer of the 80s with little modification.
For web development, read up on SQL and PHP. They're pretty much the standards. (Granted, there are several versions of SQL but they're all similar.)
C++ is good to know, but it's not very easy to pick up.
If you want to make cross-platform command line programs, learn Pascal.
Java is okay and has its uses but I think it's kind of bloated.
I've found that once you learn one language and how to "think like the computer" (to quote my old VB instructor), it's easier to learn other languages. You just have to get used to the syntaxes.
