"You can be a kernel hacker!" by Julia Evans

Writing operating systems sounds like it's only for wizards, but it turns out that operating systems are written by humans like you and me. I'm going to tell you what a kernel is and why you should care. Then we'll talk about a few concrete ways to get started with kernel hacking, ranging from the super-easy to the terrifyingly difficult.
by Julia Evans (@b0rk) - Stripe
Julia Evans loves taking apart systems to find how they work, making Serious Computer Programs do silly things, and organizing outreach events to make our developer communities a better place. She works on Stripe's data team.