I recommend you this book :
Every professional animators has it, it’s a classic that is super inspiring even for non-animator artists.
I didn’t watched the course by p2design but it seems a great resource too.
Animation is like 98% of theory, you don’t have to focus too much on the animation for game part even the tools are quite easy to understand. But once you know the basics it can translate to video games, cartoon, and whatever needs to be animated.
Here are a few random ressources :
These will probably help you to get a first glance of what is animation and it’s filled with cool little tricks, but that won’t replace proper training, be prepared to study for some months probably with an in-depth course to get somewhere.
While like you can learn modeling by doing some random tutorial here and there, and work on your own based on that, I’m a bit skeptical about doing the same with animation …
Have fun, it’s a super interesting field !