I'd never seen anything like this. There's great stuff out there, like Lynda.com, for e-learning through videos (and some of those also contain practice files), but this is a real platform where you learn by doing. I am a teacher and I perfectly know what I'm saying when I say that learning by doing is only second to learning by teaching (the most powerful learning technique). Great chance for anybody who needs to learn something fast.

Vast ever-expanding library of code tutorials that are extremely helpful and engaging

Friendly UI, badges that keep you motivated, you can learn without any previous knowledge, easy to follow and understand, great videos quality and teachers.