Probably one of the most useful, structured and interesting guides on the iOS platform.
Includes a lot of information, covering from an overview of the platform, tools and to various approaches and actions for analyzing applications!
At the end of each section there are a large number of articles, tools and documentation that can help you to understand further.
Insanely useful and high quality material. I think I’ll look more than once at it during the analysis or to recall how and what works in iOS.