My main goal is to just learn something really well in my spare time for fun. I'm not too fussed about actually building anything, so I don't mind materials that are more theoretical than practical.

I also have a secondary goal, which is to move to another industry, as I'm starting to get a bit disillusioned with front-end web development. That's in the future though, and CG would be only one of many different fields I'd be considering.