The Blockchain makes possible a series of applications such as Cryptocurrencies, Non-Fungible Tokens or Smart Contracts that promise to revolutionize the exchange and management of information as we know it today. And that's not all: the Metaverse, thanks to Virtual and Augmented Reality, is fertile ground for the application of these technologies, potentially representing a unique ecosystem of its kind. However, this ecosystem in which individuals, groups and companies will find themselves operating will not be free of challenges to be faced and opportunities to be seized. What is the goal of this book? This book aims to describe in a simple, clear and effective way the main technologies behind the Web3 with the ambition to bring more and more people to these new scenarios, present and future, and ensure that more and more people will be able to seize the opportunities offered. What will you learn by reading this book? What is and how does a Blockchain work and what are its main mechanisms The main Cryptocurrencies on the market and what are some of their main applications How to buy, exchange and store cryptocurrencies, in a safe way Some investment strategies What are Non-Fungible Tokens (NFT) and how to create or purchase them What is the Metaverse and what are some of the most interesting projects in this field This book is addressed in particular to all people curious to know what new frontiers the web is taking and what risks and opportunities may arise from them; free investors who would like to know what cryptocurrencies and NFTs are, on which technology they are based and what practical implications they may have, before investing time and money in exchanges; professionals who are curious and want to learn more about the potential applications of Blockchain in order to gain a competitive advantage for their company; professionals who are approaching the new technologies with the aim of creating their own business related to them.