Data literacy, that is, the ability to navigate the world of data, is a key skill of today. Every day, billions of messages are published on social networks, email inboxes all over the planet are buzzing with letters, and every car connected to the Internet produces terabytes of data, not to mention online stores, payment systems and government digital services. However, a minority is still able to work with data, analyze it and use it for business, and there is a catastrophic shortage of specialists. For those who want to learn to speak the data language confidently, the recognized expert in the field of data literacy Jordan Morrow wrote his book. This practical guide will allow even a layman to master the four basic levels of analytics and learn how to make effective data-driven decisions to get the most out of information and be successful in a rapidly changing digital world.