We hope that this book will contribute positively to the scientific competence of healthcare professionals and especially nursing students regarding the introductory concepts of Science, as every profession requires a deep theoretical knowledge of its subject in order to be practiced correctly. The purpose of this textbook is to provide the reader with scientific knowledge, stimuli, reflections, and skills cultivation. This textbook is written by nurses and aims to provide healthcare professionals and nursing students with the appropriate knowledge and skills for more effective management of clinical issues encountered by nurses in their daily practice. (From the presentation on the back cover of the book).