Avoiding Mistakes in Excel: Double-Checking Data, Percent Formulas & Graphs

In this Excel walkthrough, we build on the previous video using COUNTIF by showing you how to catch common mistakes (like double counting or skipping entries) and how to quickly verify totals using SUM. Then, we dive into calculating percentages. We also demonstrate how to visualize your cleaned data with pie charts and bar graphs, discuss when to show counts vs. percentages, and share formatting tips that save time and reduce confusion.