Toniko Pantoja has a great YouTube channel that has insights into his own work as well as best practices and animation tutorials
Toniko Pantoja
Animate With Arran
Animate With Arran is a YouTube channel by Arran Baker who has recently started to post some great free videos around animation process, workflow tips and more.
Jonathan Abenhaim
Jonathan Abenhaim has an amazing YouTube channel that covers a load of tips, tricks and tutorials on animation. He posts regularly so make sure to subscribe!
Animator's Resource Kit 