Twenty five years ago, this would have been "LINUX, UNIX, and serving, without a PhD" and Matt Welsh's Linux Installation And Getting Started was the intro (https://www.mdw.la/papers/linux-getting-started.pdf). I was one of many who adopted Linux early, using this book (later I read the BSD Unix Design and Implementation, which I would describe as senior undergrad/junior grad student material).
Having those sorts of resources to introduce junior folks to advanced concepts are really great to me- my experience is that I learn a lot more by reading a good tutorial than a theory book, up until I need to do advanced work (this is particular to my style of learning; I can read code that implements math, but struggle to parse math symbology).
Having those sorts of resources to introduce junior folks to advanced concepts are really great to me- my experience is that I learn a lot more by reading a good tutorial than a theory book, up until I need to do advanced work (this is particular to my style of learning; I can read code that implements math, but struggle to parse math symbology).