The great thing about this book is that it is an extensive library of working circuits with component values. This provides an excellent service as a reference design for a circuit designer, i.e. a starting point for someone who already has design chops. If you lack design chops, probably better to reference one of the thousands of books written from the perspective of explaining the basics of circuit theory. This book was never intended to be a primer on the basics of circuit theory but instead a collection of reference designs vastly useful to a design engineer.