IOS reading and favorite app

Hi, my name is Natasha. My background is in fine art and exhibition design for museums.
My current favorite apps are:

• Mint - This app enables me to track my finances. Something I was never good at before!
• National Geographic for iPad - I'm not sure if this counts as an app or a digital publication, but I love how the embedded video, sound, and other dynamic content and the way it is seamlessly integrated with content on their website.
• Plants vs Zombies -This is possibly my favorite game ever.

Three things that surprised me about the iOS guide:

1. Don't make people enter information if possible (draw from data the device has already collected) p. 26
2. That there are only three main navigation types: hierarchical, flat, and content driven p.36
3. How many design choices they essentially make for you. I'm thinking specifically of fonts, text sizes, icons, and icon sizes.