I really like this author’s style. Fast-paced tutorial, not too much hand-holding. Every word counts. If you misread, or skim, you will make mistakes. Making mistakes is also a part of development, so you can see how Size Classes and Autolayout are powerful yet so entirely tricky and complicated to debug. Makes me wonder about Apple’s technology. Yes, it’s powerful. Yes, you write no code. We like this. But if something goes wrong, well, you had better hope you’ve got an expert handy if you are not that expert yourself.
That said, I would like to say here is the ultimate crash course in Size Classes with Autolayout: