I might just be outside the target audience, for now. I don't even know any C. Realistically, I think it would have to be spoon-fed to me in some Bret Victor-esque crocodiles and eggs manner for me to not lose focus.
I went through this absolutely fantastic SQL tutorial this week. Perhaps you might find their list of pedagogical principles useful?
I think one thing that potentially could tempt me into low-level code would be making cool tunes.