This book is about the key principles and rules, adhering to and following which people can attain the secure and prosperous lives. As such, it advises everyone how to stay safe and prosper while growing up, establishing yourself in society, creating one's family and keeping it successful, with due consideration to various real-life situations that individuals, groups thereof and countries find themselves in all the time. The above-mentioned key principles are derived from the available scientific knowledge and humanity's cumulative experience to date, and proper explanation for them is given.Although there exist many motivational books and guides focusing on particular aspects of human life (such as books about how to become reach, make friends, lose weight, stay healthy, avoid certain dangers, heal particular illnesses, etc.), there does not seem to exist a book that encompasses all main aspects of living in a single manuscript and in a sufficiently brief form so that it is easy to navigate and to use in practice - a niche that this book purports to occupy. The book is based on an assertion that there are few key principles, adhering to which people can ensure the security and prosperity of their lives. The book begins with the definition and substantiation of these principles and then proceeds to discussing the rules that follow from the principles for various aspects of individual and social life. The main principles are defined as: everyone supports everyone; family is a key to secure and prosperous life; and principles and rules to be promoted and enforced. The rules stemming from the main principles are then defined and explained for individuals, groups thereof, and countries.In the book, various rules are proposed and explained for individuals in the society (dealing with other individuals; dealing with institutions; establishing yourself in the society; leading a useful social life); for individuals in the family (preparing for the creation of one's family; keeping your family successful); and for social groups (territorial/thematic groups; ideological/religious groups; business/labor groups; ethnic/nationalistic groups) and countries (main internal rules; main rules of external relations). The book concludes with the description of the recommended international rules (purpose of the rules; the main international rules; adoption of international rules) that the countries are advised to follow, and of the proposed enforcement mechanism to ensure the compliance with the rules by all.