Ask HN: Good 'Ted Talk' Type Resources for Deep Dive Linux?

Hi all, I've discovered a love for listening to lectures whilst doing other things, and the info I learn seems to go in and stick. I want to learn the deep level Linux stuff, like exactly how it all hangs together from the bootstrap through to file system types, networking, daemons etc. What are the best resources online for this type of content? I should also say I'm fairly good as a Linux user, so I already know the common stuff. Thanks!