https://www.skillshare.com/classes/Disneys-12-Principles-of-Animation-Every-Animators-Essential-Reference/1241103014
In this 14-part video course, learn the '12 Principles of Animation' as described by the legendary animators of Disney : Frank Thomas and Ollie Johnston.
I believe these principles are the basics and essential reference, every aspiring animator should refer to.
In this course, I have tried to cover all 12 principles within a short span of time, and also filled my explanations with plenty of examples to make the principles very easy to understand and practise. In addition to the classes on the 12 principles, I have included 2 bonus classes with more tips and guidelines. 
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