Lisp

I'm new to programming, and I've been learning Python and Fortran, the latter because it's part of my mathematics degree. I want to learn Lisp because it supposedly makes you a better programmer. Which dialect should I learn?

>>10
Oh shut up and go scrub another toilet you fucking damn idiot. Again, you're stupid. And again, you don't have what it takes to be a computer programmer. Now go run along and write some more toy code you dumb bitch.