00:00 – 1. Module Introduction

01:09 – 2. Three Trees Widget Tree, Element Tree & Render Tree

05:56 – 3. How The UI Is Updated

12:47 – 4. Refactor & Extract Widgets To Avoid Unnecessary Builds

19:21 – 5. Understanding Keys – Setup

23:55 – 6. Which Problem Do Keys Solve

29:29 – 7. Understanding & Using Keys

33:41 – 8. Mutating Values in Memory & Making Sense of var, final & const

40:38 – 9. Module Summary