https://www.oreilly.com/library/view/linux-fundamentals-2nd/9780137929313/ https://www.oreilly.com/library/view/linux-fundamentals-2nd/... https://www.oreilly.

https://www.oreilly.com/library/view/linux-fundamentals-2nd/9780137929313/ https://www.oreilly.com/library/view/linux-fundamentals-2nd/... https://www.oreilly.com/library/view/fundamentals-of-linux/9781789530957/ https://www.oreilly.com/library/view/fundamentals-of-linux/9... https://training.linuxfoundation.org/oreilly/ https://training.linuxfoundation.org/oreilly/ Not sure about courses, but you can read their excellent books.