This document provides training on data visualization and transforming data into diagrams. It discusses choosing the appropriate type of visualization based on the data and questions, including pie charts to show parts of a whole, bar charts to compare categories, line graphs to show changes over time, and maps to relate data to geography. Guidelines are provided for effectively designing each type of visualization, such as limiting the number of pie chart segments and starting bar and line graphs at zero. The importance of telling a story and engaging readers is also emphasized.