An effort has been made to investigate the topic using terminology that is as straightforward as possible in order to make it more simply digestible for pupils. The book has a number of illustrations, such as flowcharts and diagrams that make it simple for students to comprehend complex ideas. It is the author's honest desire that both students and academicians would take something helpful away from reading this book. I am hoping that both the students and the teachers will have positive reactions to this book. We are open to hearing recommendations regarding any and all aspects of the profession. We take full responsibility for any deviations or errors that may have been overlooked, and we would be extremely appreciative if readers would bring them to our attention if they did occur.