Michael Hartl's guide is excellent and can back that up as as a great starting point.
If you plan on running with a project that's already going that is going to slow down your learning curve. I would recommend doing things from scratch. It's important you truly understand what is happening then just a copy/paste action.
Some could be taking this article a bit too serious. I self taught myself to code 6 months ago and like enjo stated it seems very littered and perhaps too flexible.