This book addresses the fundamental Internet of Things (IoT) technologies, architectures, application domains and future research directions. It also discusses how to create your own IoT system according to applications requirements as well as presents a broader view of recent trends in the IoT domain and open research issues. This book encompasses various research areas such as wireless networking, advanced signal processing, internet of things, and ubiquitous computing. Internet of Theory to Practice, discusses the basics and fundamentals of IoT along with real-time applications as well as challenges and open research issues associated with it. The book includes several case studies about the use of the Internet of things in day-to-day life. The authors review various advanced computing technologies such as cloud computing, fog computing, edge computing, and big data analytics that will play a crucial role in future IoT-based services. The book provides a detailed role of blockchain technology, narrow-band IoT (NB-IoT), wireless body area network (WBAN), LoRa (a long-range low power platform), and Industrial IoT (IIOT) in the 5G world. This book is intended for university college students as well as amateur electronic hobbyists and industry professionals who are looking to stay current in the IoT domain.