How to Fix Dates That Excel Treats as Text
Dates that look correct but won’t sort or calculate are usually text, not real dates. Learn how to diagnose and fix this with DATEVALUE, TRIM, and CLEAN.
Data Cleaning
Automation
How to Troubleshoot Slow Excel Formulas in a Workbook That Used to Be Fast
Learn how to troubleshoot slow Excel formulas. Identify volatile functions, entire-column references, and VLOOKUP on large ranges — then fix them with faster alternatives.
Lookup
Why the LOOKUP Function Still Appears in Excel Workbooks
Discover why the old LOOKUP function still appears in Excel workbooks and when to replace it with XLOOKUP or INDEX+MATCH. Includes migration formulas and risk assessment.
Errors
How to Fix Excel When Formulas Stop Recalculating Automatically
Learn why Excel formulas stop recalculating automatically and how to fix it in 4 steps. Covers Manual mode, Text format, Show Formulas toggle, and VBA xlManual—with keyboard shortcuts.
Excel Functions
Why OR Conditions Don’t Work as Expected in Excel Formulas
Writing “OR” inside Excel formulas does nothing. Learn how to express OR logic correctly in IF, COUNTIF, SUMIF, FILTER, and SUMPRODUCT for accurate results.
Excel Functions
Why COUNTIF Returns 0 Even When Values Exist
MATCH returns #N/A even when the value is visibly in the list. Learn the three root causes — type mismatch, hidden spaces, and wrong match_type — and how to fix each one.
Lookup
Why MATCH Can’t Find Values That Clearly Exist in Excel
MATCH returns #N/A even when the value is visibly in the list. Learn the three root causes — type mismatch, hidden spaces, and wrong match_type — and how to fix each one.
Data Cleaning
Why Excel Conditions Fail Because of Extra Spaces
A single invisible space makes COUNTIF, SUMIF, and IF return wrong results. Learn how to detect, remove, and prevent extra spaces in Excel condition formulas.
Excel Functions
How to Combine Multiple Cells Into One Line With TEXTJOIN in Excel
CONCATENATE and & leave double delimiters when cells are blank. TEXTJOIN handles blank cells cleanly and joins ranges in one formula.
Excel Functions
Why Excel Formulas Break When You Copy Them
Copying a working formula can quietly shift the wrong cell references. Learn how relative, absolute, and mixed references work and how to lock the right ones.
Automation
Why Pivot Tables Don’t Update After Refresh
Pivot Tables sometimes look unchanged even after Refresh. Learn why fixed source ranges and shared caches cause this, and how Excel Tables fix it permanently.