Zeid teaches you why the machine moves the way it does. If you rely only on software tutorials, you crash the machine when doing 5-axis machining. If you read Zeid, you know the kinematics behind the crash.
If you search for the "Ibrahim Zeid CAD CAM Theory and Practice PDF," you are likely looking for the (published 2009), which added substantial content on rapid prototyping and internet-based collaborative design. ibrahim zeid cad cam theory and practice pdf