Pivot tables are one of the most valuable tools in Microsoft Excel. They let you quickly summarize a large data table and slice and dice that data any way that you want. You can even create a dynamic chart from that data using pivot charts.
This book provides a detailed introduction to using pivot tables as well as pivot charts, although it does presume prior familiarity with regular charts in Excel.
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This book is part of the Easy Excel 365 Essentials series of titles. These are targeted titles that are excerpted from the main Excel 365 Essentials series and are focused on one specific topic.
If you want a more general introduction to Excel, then you should check out the Excel 365 Essentials titles instead. In this case, Intermediate Excel 365 which covers pivot tables as well as a number of other topics, such as charts and conditional formatting.