This is a comprehensive reference for managing systemd services on Linux. It covers the basics like starting, stopping, and enabling services, then digs into writing service unit files with examples for Node.js and Java apps. You'll find practical sections on resource limits, security hardening options like ProtectSystem and PrivateNetwork, and using journalctl to actually read logs in a useful way. The timer units section is solid if you're replacing cron jobs. What makes this useful is the concrete configuration examples and the troubleshooting table at the end. It assumes you already know why you need systemd and jumps straight to the how.
npx skills add https://github.com/chaterm/terminal-skills --skill systemd