If you want a "basic"-type programming language that's fairly simple to learn, try python. It has a very easy to learn syntax and is like basic in a lot of ways.
The best part is that it's already on your Mac! Just open the "Terminal" program (under Applications -> Utilities) and type "python" at the command line.
I suggest checking out this online book,
http://diveintopython.org/toc/index.html, that explains how to get started.
Yeah, BASIC is kind of outdated. It's a broad term too, there are so many variants.
Dive into Python is great. That's mostly how I learned Python. Still, it might be too hard for a beginner. If you've never programmed anything before, or if Dive into Python seems over your head, start with A Byte of Python, then read Dive into Python. Byte of Python is aimed at newbies.
http://www.swaroopch.com/byteofpython/ http://docs.python.org has a tutorial and the library reference. After you've read the books, familiarize yourself with the library reference. You don't have to memorize it but knowing where to look is a good thing. (You might want to memorize the Built-in Objects though. It helps with programming a lot.)
Thanks guys!. really helps.