In this episode, you will learn about key parameters on widgets: when you need keys, where to put keys in your widget tree, and which key is right for you. More specifically, you'll learn about he nuances of how keys work, discern when to use keys in your widget hierarchy, and identify the appropriate types of keys to optimize your widget-based structures. Chapters: 0:00 - Intro 0:39 - When to use keys 2:20 - How keys work 5:13 - Where to put keys 6:53 - Types of Keys Watch other episodes in the series → http://bit.ly/FlutterWidgets101 Subscribe to Google for Developers → https://goo.gle/developers