Urban prepping spans a wide range of actions, attitudes, equipment, and intensity. This makes sense since people live in a variety of settings, and very few are able to wander out into nature and live off the land. You do not have to go wild constructing bunkers and stockpiling weapons for an end-of-the-world catastrophe. Just take a few steps to prepare your home for difficult times, such as storms, floods, civil emergencies, and extended outages. If you can be self-sufficient for a while, at least you will not be part of the problem, rushing about in potentially unsafe conditions to get food, water, medicines and supplies, or calling overwhelmed first responders for help.
I think this book contains practical ideas for almost every household, plus recommendations for customizing your approach given your own situation. For example, some urban residents do not have any arable land, while others may have an acre or even more, suitable for gardening. Some have like-minded neighbors, others have neighbors who may become thieves when times get hard. Some families are large and need to prep for a wide range of people, including children and the elderly. Other people live alone, or with a partner. From a practical standpoint, you probably won't be able to "turn your house into the safest place on earth," but you definitely can take some steps to become more self-sufficient. I am putting this book on my "currently reading" shelf because it is not a read-from-cover-to-cover book, but is a reference worth keeping handy.