Prepare to learn some new debugging tricks! In this course, you'll improve your skills with LLDB and Xcode.

• Create exception breakpoints to make finding the cause of an unhandled exception easier. See how to share breakpoints between projects or multiple users of a project.
• Learn about the three ways to inspect data in your app and the danger that comes with the power.
• Learn how to quickly spot issues where UIKit code is being called from a background thread

https://www.raywenderlich.com/4744-intermediate-ios-debugging