Trouble getting started

First, I’m an experienced MS ASP.NET developer who just got his first Apple Product for Christmas (MacBook Air), and I’m very Impressed.
Second, I bought “iPhone Programming The Big Nerd Ranch Guide” (Kindle version).
Third, I downloaded and installed XCode 4 version 4.2.1, Build: 4D502.

My problem is that the examples in the eBook do not appear to be corrolated to the version of XCode 4 that I have.

Have I done something wrong while installing, or is there something I can do to get them in synch?

Thank you in advance for any assistance you can lend in this regard,
Jack Webb

Xcode (and more broadly iOS/Mac programming) have been evolving quickly lately; you’ll find several discussions in these forums for adapting to the newer requirements.

Ideally there would be conversation labels or other metadata we could use to search for them, but if you look through the forum specific to your book, you’ll likely find the help you need.

There’s one prominent thread to help, visible from all the forums:

I tried to capture some highlights from my own reading and guesswork, but keep in mind I’m very, very inexperienced: