The modern world cannot be imagined without data, and the effectiveness of working with it largely depends on their visual presentation. There are a lot of tools for analyzing and visualizing data, and in this book we will talk in detail about one of them - Yandex DataLens. Reading this book, you will make an exciting journey from the very basics to the heights of mastery in handling this powerful cloud tool. Together we will build several colorful dashboards, and besides that you will learn everything about connections, datasets, charts, functions, including window ones, and LOD expressions. The publication will be useful for those who want to master the art of visualizing data from scratch, as well as those who already have experience with Yandex DataLens and want to expand their knowledge and skills.