Give a bibliography and general concepts for iPhone development

Question

iPhone

Please tell us what and how in iPhone development.
What is written front-end, back-end, pluses and difficulties. And all that is worth knowing for those who want to do this.

Answer 1

The first thing to know is that this question has already been asked by many.
The first thing you need to learn is to use the search, for example, on a toaster
Write an application for the iPhone from scratch
iphone web-based framework
habrahabr.ru/post/86597
and so on. And only then, having smoked at least a little, start asking meaningful questions.