This book is a collection of established ideas and thoughts and template essays, which cover common psychological disorder such as personality disorders; general anxiety; Obsessive Compulsion Disorder; Dementia Sleeping disorders; depression; schizophrenia; Autism Spectrum Disorder eating disorders, addictions, self-harm and self-injury; ADHD; and so much more. Each chapter consists of an average of five essays per chapter. All chapters' summaries in this book include a list of psychological tools, inventories and scales used by clinical psychologists and psychiatrists, supported by academic references. The book also includes a real life case study, which can be used as a template for academic or professional purposes.