We hope that this book will positively contribute to the scientific competence of healthcare professionals, especially nursing students, regarding the introductory concepts of Science, as every profession requires a deep theoretical understanding of its subject in order to be practiced correctly. The aim of this manuscript is to provide the reader with scientific knowledge, stimuli, reflections, and the development of skills. This work is written by nurses and aims to offer the professional nurse and the nursing student the appropriate knowledge and skills for the more effective handling of clinical issues faced by nurses in daily practice.