Anything From Julia Evans
It’s not often that anyone can take up basic linux literacy and make it interesting, but Julia Evans1 does it with style. Here is her zine on pipes2:
She doesn’t just illuminate linux, she will often bring that same clarity to more advanced topics such as service discovery. Here is a zine from a blog post 3 she wrote on Stripes engineering blog.
So, checkout the zines, or one of her many posts on kubernetes or networking and learn something.