This article introduces a classic four-book series titled "Understanding Your Child," authored by psychologists from the Tavistock Clinic and aimed at different age groups from 0-14. The specific focus of this text is the final book, addressing adolescents aged 10-14, viewing them as "little adults" filled with internal conflicts and confusion. It emphasizes that the book is not a quick-fix guide but rather a "manual of the adolescent unconscious," offering insights from a psychoanalytic perspective to clarify the complex relationship dynamics and unconscious conflicts of this age group. The text breaks down the content into two main sections: first, exploring the significant physiological and psychological changes adolescents experience, including sexual development and "regressive behaviors," and second, analyzing their evolving relationships with parents and peers, highlighting the crucial need for self-identity formation and the unique role of friendships and group affiliations in providing support and a sense of belonging during this transitional period.