GNU/Linux: what it is, how it works, and how a distribution is built
A complete introduction to GNU/Linux: GNU vs. Linux, the kernel, distributions, systemd, terminal, desktops, package managers, security, containers, and current distributions.

A complete introduction to GNU/Linux: GNU vs. Linux, the kernel, distributions, systemd, terminal, desktops, package managers, security, containers, and current distributions.
What hardware drivers do, how they differ from firmware, where to get trusted Windows and Linux drivers, and when updating or rolling back makes sense.