There are so many great After Effects tutorials online that its a real challenge to edit them down to just a short list. The following are just a few of my favourites.
The grand-daddy of motion graphics and visual effects tutorials, Video Copilot has written the book on how do things with After Effects.
Their beginner tutorial series is a great place to start.
For the novice to intermediate After Effects user. These guys have been around for a long time. High quality video instruction makes these tutorials easy to follow.
Mt. Mograph is a Youtube channel that covers some big concepts. It is also the source of one of the best AE plugins, Motion2. Here is a tutorial about how to use the Motion2.
This Youtube channel includes a 4 part series that shows how to use easing to create dynamic and expressive kinetic typography.
Skillshare has many After Effects tutorials series that go into some detail about how to achieve many different effects. This is a paid site, however I think it’s worth every penny.
This is Adobe’s Character Animator tutorial Youtube channel.
I will be adding to this list. As well please send me your suggestions for great tutorials.