Fundamentals of Linux
by
Oliver Pelz
Description: Fundamentals of Linux by Oliver Pelz covers essential Linux command-line tools, shell scripting, and file permission management, providing a basic understanding of operating system functions and virtualization concepts
ISBN: 9781789530957
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.