The book begins with an introduction to the ESP32 and its features, followed by a chapter on getting started with the Arduino IDE. Once you have a basic understanding of the ESP32 and how to program it, you can start building projects. The book is divided into several sections, each of which focuses on a different type of IoT project. For example, there is a section on smart home projects, a section on environmental monitoring projects, and a section on wearable device projects. Each project in the book includes a detailed step-by-step guide, as well as circuit diagrams and code snippets. The author also provides troubleshooting tips and suggestions for further exploration. This book is a great resource for anyone who wants to learn how to build IoT devices with the ESP32. It is well-written and easy to follow, and it covers a wide range of projects, from simple to complex. If you are interested in learning how to build connected devices with microcontrollers, then 100 Essential ESP32 IoT Projects is the book for you. It is a comprehensive guide to ESP32 development, and it contains a wide variety of projects to choose from. This book is suitable for readers of all skill levels, from beginners to experienced developers. If you are new to ESP32 development, then the book will teach you everything you need to know to get started. If you are an experienced developer, then the book will provide you with a variety of challenging and rewarding projects to work on.