- LFS201 course material
- UNIX & LINUX Sysadmin Handbook
- Ubuntu Server guide
- CommunityHelpWiki1
- Tecmint
- DigitalOcean
- Unix&Linux
- AskUbuntu
- ServerFault
- Linuxize
- LinuxConfig
- LinuxBabe
- LinOxide
- HowToGeek
- TheGeekDiary
- UNIX toolbox
- Arch wiki
- OpsSchool
- Debian Handbook
- CompTIA Linux+ (XK0-004) course
- EnableSysadmin
- OpenSource
Footnotes
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beware, not always up to date ↩