https://www.oreilly.com/library/view/fundamentals-of-linux/9...
https://training.linuxfoundation.org/oreilly/
Not sure about courses, but you can read their excellent books.
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https://www.oreilly.com/library/view/fundamentals-of-linux/9...
https://training.linuxfoundation.org/oreilly/
Not sure about courses, but you can read their excellent books.