We all want our children to grow up smart, reasonable, successful, sensitive and, of course, happy. But if science education is more or less organized in school, then what about the rest of the knowledge and skills? This book will answer the most important questions and help parents develop 21st century skills in their teenager. In particular, here you will find information about: self-organization, systematic, creative and critical thinking and how to help your teenager develop it. Caring parents will find in this book tips for all cases when complex things need to be explained to a teenager simply and clearly. This is a training book, so it contains a lot of exercises and simulators. Use them, they work. Good luck!