Learn VIM while playing a game - VIM Adventures
regex101: build, test, and debug regex
Git
trimstray/test-your-sysadmin-skills: A collection of Linux Sysadmin Test Questions and Answers. Test your knowledge and skills in different fields with these Q/A.
LinuxCommand.org: Learn The Linux Command Line. Write Shell Scripts.
Free Networking tutorials, System Administration Tutorials and Security Tutorials - omnisecu.com
cheat.sh/:firstpage
Tutorials | DigitalOcean
Ops School Curriculum — Ops School Curriculum 0.1 documentation
explainshell.com - match command-line arguments to their help text
Crontab.guru - The cron schedule expression generator
Find And Compare Open Source Projects
GitHub - kahun/awesome-sysadmin: A curated list of amazingly awesome open source sysadmin resources inspired by Awesome PHP.
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