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This is the method I use to animate in the motion editor, and it is certainly not the only method. You should use this as a guide to get started, then you can perhaps create your own technique when you get better.
I'm by no means a professional animator; this video is so I can share with you guys all the stuff I've learned over the last couple years. Hope you will learn something useful from this :D
Timestamps:
00:00 Fixing camera FOV
00:36 Overview of tutorial
00:57 Blocking the animation
02:02 Round preset to make smooth animation
03:52 Adding an arc to the animation
05:12 Adding more detail
05:25 Adding detail: Anticipation
06:25 Adding detail: Blinking
08:13 Adding detail: Body movement
11:30 Checking the animation
11:41 Adding additional smoothing using round preset
12:17 Final render
12:29 Conclusion
Tracklist:
Art of the Dress by Archie
Love is in Bloom by Archie
Becoming Popular by Archie