Solid reference for standing up and securing Linux servers, focused on Ubuntu/Debian stacks. Covers the essentials you'd actually use: initial hardening with SSH key auth and disabled root login, UFW firewall rules, Nginx reverse proxy configs, Let's Encrypt SSL setup, and systemd service files. The commands are copy-paste ready, which is exactly what you want when you're SSH'd into a VPS at 2am. It's not comprehensive server administration, more like a curated cheat sheet of the 80% of tasks you do repeatedly. If you manage web servers but don't do it daily enough to remember every nginx directive or systemd option, this gives you working examples to adapt.
npx skills add https://github.com/duck4nh/antigravity-kit --skill linux-server-expert