Topic list · Beginner
Systems & Ops
Foundational concepts — the shortest path into the topic. 12 topics across 5 chapters.
01
Linux Basics
5 topicsLinux Speedrun
Directory layout, the minimum command set, shell redirection — the first door into ops.
File Permissions (rwx & ugo)
What does `rwxr-xr-x` actually mean — explained once, in full.
Processes, Signals & Zombies
`kill -9` doesn't 'really kill' — what you think you know about processes might be wrong.
Users, Groups & sudo
Ops rule #1: every service runs under its own non-privileged user.
Disks, Filesystems & Mounts
df, du, mount, fstab — minimum knowledge to inspect disks and add partitions.
02
Shell & Troubleshooting
2 topics03
Services & Cron
3 topics04
Packages & Software
1 topics05