If you learn computer architecture in depth, there is so much to learn, but it explains very well what you need and what you don't know. I bought the book and studied on my own, but I thought this was really not it, so I listened to the lecture review because it was good, and I think it was good. It explains the core technologies in order of principles, leaving out all the unnecessary things, so it's easy to understand and doesn't leak to other areas, which I like. Above all, it's good because it tells you why you're learning this and why it's necessary, so you can know where you can use what you've learned.