Probably one of the most useful, structured and interesting guides on the iOS platform from @vadimszzz (the guide is also available as a payst with a working Table of Contents and a good design, it doesn't make it all right).

Includes a wealth of information ranging from platform overview, tools to various tricks and workflows for analyzing applications!

At the end of each section, there are a large number of links to articles, tools, and documentation that can help you figure it out further.

Insanely useful and high-quality material from the reviews of my acquaintances reverse engineers, with whom I managed to share. Many have already saved them to their bookmarks and I think they will look more than once during the analysis or to understand how and what works in iOS.

bbabo.Net