I started my web career way before WPDevDesign, but never went too deep with code. Then I found Oxygen. And this site. When I signed up 2 years ago, I didn’t think I would have much use of it, but oh boy… was I wrong!
I learned PHP and a LOT of Oxygen (and WordPress too) just from reading Sridhar’s (and then David’s) tutorials. It’s the best resource to have as a beginner developer, and even as an experienced one. I recommend it 🙂