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.
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.