I hadn’t heard of Great Books of the Western World before but I’ll definitely check it out! I do something similar with movies and “1001 Movies You Must See Before You Die” which is also a great resource.
I still can’t bring myself to write in books for some reason, but I did take notes on all the non-fiction books I read last year. I haven’t kept up with that because it didn’t seem to help me with processing, remembering, or using the book much beyond being able to find references more easily. It was useful to find the references more quickly but didn’t seem worth the time invested in note taking. I’ll check out “How to Read a Book” to see if I can get better there.