I haven't put up just a collection of interesting links in a long time... Sometimes you just come across so many amazing things that you can't wait to post them and here's some really great found animated resources.
Clay Kaytis, wrote a animation letter to himself when he was starting out as animator, worth reading but read the transcript as his handwriting might confuse you. Find it on Animation Letters Project
Interesting show about The Science of Attraction on Channel 4, animators take heed to this as this is all about Appeal. More videos from the same series