Hi,
Seeing as these questions come up often in this forum, here is a compilation of resources that are available to help learn about Animation Rigging. We’ll update this thread as more resources become available.
I’m hoping this is useful to everybody 
Manual:
https://docs.unity3d.com/Packages/com.unity.animation.rigging@latest/index.html
Samples:
Talks:
Introducing the New Animation Rigging Features (GDC 2019): https://www.gdcvault.com/play/1026151/
Introducing Animation Rigging for 2019.3 (Unite 2019):
https://www.youtube.com/watch?v=9IBhQMYYYWs
Extending the Animation Rigging package with C# (Unite 2019):
Freeform Animation Rigging (GDC 2020):
https://www.gdcvault.com/play/1026754/
Improve your animation workflow with Animation Rigging (Unite Now 2020):
Tutorials:
Procedural motion for animated skeletons:
Blogs:
Introducing the Animation Rigging preview package for Unity 2019.1: Unity Blog
Advanced Animation Rigging: Character and Props interaction: Unity Blog
Learn how Animation Rigging can level up animation in your project: https://blogs.unity3d.com/2020/06/18/learn-how-animation-rigging-can-level-up-animation-in-your-project/
Projects:
Animation Rigging - Crane - Example: GitHub - Unity-Technologies/animation-rigging-crane-example: Animation Rigging - Crane - Example
Advanced Animation Rigging: Character and Props interaction: GitHub - Unity-Technologies/animation-rigging-advanced-character-interaction: Advanced Animation Rigging: Character and Props interaction
Animation Rigging workshop (SIGGRAPH 2019): GitHub - Unity-Technologies/animation-rigging-workshop-siggraph2019: Repository for SIGGRAPH 2019 Animation Rigging workshop
Animation Rigging: Advanced Setups: GitHub - ciro-unity/AnimationRigging-AdvancedSetups: Distributable samples demonstrating advanced setups and use cases for Unity's Animation Rigging package
