Book excerpt: MrExcel 2021 is designed to make the reader far more efficient in their use of Microsoft Excel. Originally designed for Bill Jelen's live Power Excel seminars, the target audience already uses Excel 40 hours a week. These tips are the "aha" tips that uncover secret methods in Excel. The book covers general Excel functions, pivot tables, formulas such as VLOOKUP and the new XLOOKUP. It introduces elements of modern Excel such as the Power Pivot Data Model and cleaning data with Power Query. Updated annually, this edition for 2021 adds information on LET and LAMBDA functions, amazing new data types, dynamic array formulas, and more.