The book is to provide new updates to presently available scientific content and data worldwide related to positive and negative effects of COVID-19 pandemic on healthcare, economy and environment. Besides focusing on impact, this book will also focus on the strategies that will be helpful in overcoming such impact so that world will be prepared in coming future if any pandemic comes. This book will present a complete guide covering all factors that have impact on day to day life. This book will elaborate the healthcare system role that collapsed due to unpredictable numbers of COVID-19 patients and will also share the solutions from experts' experiences for how they overcame such limitations in order to manage such infections. Worldwide lockdown during COVID-19 infection somehow significantly showed positive impact on our environment, therefore this book will also touch on certain landmark policies made by certain governments after COVID-19. This book will also explain fundamental issues and approaches with easily understandable explanations, and contains basic problems with their solutions, case studies, equations, and informative tables and schemes to let readers learn faster. This book will easily gain acceptance among the audience from healthcare, economy and environmental sciences.