Embedded systems for hobbyists is a lot larger than the world of Arduino. New and interesting projects will open up to you once you explore other platforms.
Googling quick answers is great, as far as it goes. But consistent, persistent practice is still the best way to learn something deeply and comprehensively.
It seems like we are all complaining of not having enough time, even with realtime communications and a smart phone in every pocket. These 3 tips will help!