Part 0 — Start here

0.1 Who this is for

You are…	This guide fits?
A software engineer who's never had to think below the application layer	Yes — start at Chapter 1
An engineering manager who wants to understand what your team means by "OOM killed the pod"	Yes — read the "Why this matters" boxes even if you skip the hands-on parts
Someone moving into an SRE/platform role	Yes — this is close to the actual on-call curriculum
Already comfortable with `ps`, `grep`, and Docker	Skim Phase 1-2, start deep at Part 14
Looking for kernel-internals/driver-development depth	This guide explains mechanisms clearly but stops short of writing kernel code — see Part 19 for where that lives