When I was and ACM member (when I was a student) I found many useful books in their digital library (https://dl.acm.org/ https://dl.acm.org/). They also had a h

When I was and ACM member (when I was a student) I found many useful books in their digital library (https://dl.acm.org/ https://dl.acm.org/). They also had a huge collection of online courses. I've just went to their site and I can see that some of those things still exist, e.g. https://learning.acm.org/e-learning https://learning.acm.org/e-learning.