Can you recommend a book which is more practical in terms of learning the fundamental rule of laying a PCB (such as when to draw a plane, when and how to segregate analog and digital ground plane, etc)?
There is no single "cookbook" on designing printed circuit boards. A printed circuit is an electronic component with inductance, capacitance, resistance, and material losses. Some or all of those things have to be considered, depending on the kind of circuit you are designing.
There are a couple of excellent books that cover some of the considerations for designing a good circuit board. These are just two from a dozen or so that should be in a PCB designer's library.