Okay /ic/

I've been drawing for awhile, but I feel like my fundamentals are still weak as shit. How do I study things like form and perspective most efficiently? Just choose something you want to get good at (arms for example) and then just study the shit out of it? Does that help fundamentals as much as it just helps understanding how the arm is made up? I've checked out the stickie but it all seems like specifics instead of general basic skills.