The author expresses gratitude to God Almighty, because of the abundance grace and the cooperation of various parties, this book has finally been completed. This book is the result of an in-depth analysis of the current conditions regarding the implementation of the current learning practices. The author would like to thank all those who have helped in the writing of this book and who have provided ideas and encouragement to complete this book. In addition, the authors would also like to thank other contributors whose works might be used in this book and also all the authors of websites and blogs whose works have been used as additional material in the writing of this book. Behind the various shortcomings, the author hopes that this book will contribute and be useful for readers. The author realizes that this book is still far from perfect. Therefore, with all humbleness, the author hopes for constructive suggestions for the perfection of this book.