I did this course during the pandemic. If I remember correctly it mostly went over system profiling. There are some sections on reading systemd (unified logging) which I found interesting, but have never used. If you're unfamiliar with linux I think you will find it useful, plus it is free. It is mostly pictures and not very long. If anything save it and keep it if you need to reference it.
I found this video useful for learning about systemd. https://www.youtube.com/watch?v=i4CACB7paLc&t=19s