I did a joint major in math and computer science for undergrad so I missed out on a lot of subjects like computer architecture, operating systems, and compilers

I did a joint major in math and computer science for undergrad so I missed out on a lot of subjects like computer architecture, operating systems, and compilers. This looks like the perfect depth for me to get up to speed at a relaxed pace over a few months: simpler than a textbook but more robust and instructive than blog posts, Wikipedia etc. A few cents: - not sure if it's already nestled in some chapters, but cryptography is the most important missing topic imo - if there ends up being a print copy I would happily purchase it - the name makes it hard to find: a google search for "computer science book" doesn't have a first page result