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The best time to learn a new Linux tool is when nothing is on fire.
Pick one command you use often and go one level deeper this week.
Already use grep? Try grep -r, grep -v, grep -E.
Already use find? Add -exec to actually do something with the results.
Already use systemctl? Try systemctl list-dependencies.
You don't need a course. You need 20 minutes and a test machine. man is still the best documentation that exists.
