PenguinTutor - Creating 2D Animations using Blender 2.8 and Blender 2.9
GameEngineBook | The Complete “Game Development with Blender” Book. Now Free.
Blender Animation Rig - Unity Answers
Introduction — Blender Manual
Scaling keys in the Graph Editor is kind of a mess - Animation and Rigging - Blender Artists Community
Been working on a Lottie animation editor to edit Lottie animations without After Effects and combine with your models for apps or games: lottielab.io : r/blender