Operating systems cover vast content and have many complex and difficult parts, but the illustrations and lecture content explain everything in a way that is very easy to understand 👍 I highly recommend this to anyone who has found it difficult to study operating systems using the thick "Dinosaur Book" or to those who are studying operating systems for the first time! (If I were to point out one very minor flaw in the lecture, it would be that the volume sounds a bit low at the beginning of the videos!)