Rigging Dojo is a website that helps artists overcome the obstacles of computer animation production by focusing on teaching the art and science of character rigging. They have tutorials for both rigging and animation.
I Want to be an Animator is a Youtube collection of free Lessons, Tutorials and Tips about 3D Animation, mostly focusing on the basics and principles.
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!