This video covers a few example of questions involving "u-substitution".
I go through a quick cram-example at the start and then delve further into the conceptual understanding and some deeper and more complex style questions.
Timestamps:
00:00 - Intro
1:00 - Example Question
4:30 - Understanding the Concept
7:35 - Application Q1
14:50 - Application Q2 + Demystifying Notation
20:10 - Application Q3