/usr/share/doc/sreeglug
the community knowledge archive — documentation, tutorials, books, links
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Documentation GNU/Linux
Debian documentation
The universal OS's manuals — installation, administration and packaging, all free.
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Documentation GNU/Linux
Linux kernel documentation
Straight from kernel.org — how the kernel is built, configured and developed.
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Tutorial GNU/Linux
Linux Upskill Challenge
A free 21-day self-paced challenge to get comfortable administering a real Linux server.
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Documentation GNU/Linux
Arch Wiki
Distro-agnostic, brutally thorough Linux documentation. When something breaks, this is where the answer usually lives.
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Book GNU/Linux
The Linux Command Line (book)
William Shotts' complete, free book on the shell — the single best introduction to the command line.
by William Shotts
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Tutorial GNU/Linux
Linux Journey
Short, friendly lessons that take you from 'what is an OS' to networking, processes and packages — the classic first stop.