Excel Date Serial Numbers Explained Without the Mystery
A practical explanation of Excel date serial numbers, date systems and fractional-day time values.
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A1 vs R1C1 References: When Each Style Is Useful
How A1 and R1C1 reference styles differ, including why relative R1C1 references require a base cell.
Read →How to Read a Long Spreadsheet Formula Without Getting Lost
A method for breaking long spreadsheet formulas into understandable pieces.
Read →XLOOKUP Fallbacks: Blank, Zero or “Not Found”?
How to choose a useful XLOOKUP fallback instead of hiding missing data.
Read →Five Ways Imported Text Breaks Formulas
Common hidden text problems that cause lookups, comparisons and date formulas to fail.
Read →SUMIFS Design: Put Business Rules in Cells
Make SUMIFS reports easier to maintain by separating business rules from formula syntax.
Read →When FILTER Is Better Than a Helper Column
How to decide between dynamic FILTER formulas and traditional helper columns.
Read →Formula Handoffs Across Regions: A Pre-Send Checklist
A practical checklist for sharing formulas with users in different language and regional settings.
Read →LET Makes Repeated Calculations Easier to Audit
Why LET can make complex formulas easier to read, test and maintain.
Read →Do Not Hide Every Error With IFERROR
Use IFERROR deliberately so real spreadsheet problems remain visible.
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