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. 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. The book concludes with the description of the recommended international rules that the countries are advised to follow, and of the proposed enforcement mechanism for the rules.