Protect Excel Sheets and Workbooks the Right Way
Lock formulas while letting people type in input cells, protect the workbook structure, and understand what Excel protection does — and does not —…
Read article →Run-time Error 1004 in Excel VBA: 7 Common Causes and How to Fix Them
Run-time Error 1004 in Excel VBA: 7 Common Causes and How to Fix Them
Run-time error 1004 is Excel VBA’s catch-all error. Here are the 7 causes I see most often — with the exact fix for each.
Read article →Decision Trees in Python: A Model You Can Actually Read
Decision Trees in Python: A Model You Can Actually Read
Train a decision tree classifier with scikit-learn, print its rules as plain if/else text, measure accuracy honestly with a test split, and avoid overfitting…
Read article →VBA Plus / Macros Chapter – 1 (Swap Values – 1)
VBA Plus / Macros Chapter – 1 (Swap Values – 1)
This example teaches you how to swap two values in Excel VBA. You will often need this structure in more complicated programs as we will see later.…
Read article →Outlook Rules and Quick Steps That Actually Clean Your Inbox
Outlook Rules and Quick Steps That Actually Clean Your Inbox
Set up Outlook rules, Quick Steps, search folders and a few smart habits so your inbox sorts itself — with real examples for reports,…
Read article →XLOOKUP vs VLOOKUP vs INDEX-MATCH: Which One Should You Use?
XLOOKUP vs VLOOKUP vs INDEX-MATCH: Which One Should You Use?
A practical comparison of VLOOKUP, XLOOKUP and INDEX-MATCH in Excel — when each one works, when it breaks, and which to use in 2025.
Read article →Google Sheets QUERY Function for Excel Users
Google Sheets QUERY Function for Excel Users
Google Sheets’ QUERY function lets you filter, group and sort with SQL-like syntax in one formula. Learn it with examples mapped to Excel features…
Read article →Linear Regression From Scratch in Python: How a Model Actually Learns
Linear Regression From Scratch in Python: How a Model Actually Learns
Code linear regression with gradient descent in plain NumPy, watch the model learn slope and intercept, then check it against NumPy and scikit-learn. The…
Read article →Unpivot Monthly Columns into a Clean Table with Power Query
Unpivot Monthly Columns into a Clean Table with Power Query
Turn a wide report with Jan–Dec columns into a tidy Month/Value table using Power Query’s Unpivot — so pivot tables, charts and SUMIFS finally…
Read article →Outlook Calendar Tricks for Busy Weeks
Outlook Calendar Tricks for Busy Weeks
Practical Outlook calendar features: Scheduling Assistant, shorter meetings by default, a second time zone, focus blocks, propose new time, sharing and quick keyboard shortcuts.
Read article →Power Automate Desktop: Build Your First Flow to Rename and Sort Files
Power Automate Desktop: Build Your First Flow to Rename and Sort Files
Build a first Power Automate Desktop flow that renames downloaded reports with today’s date and moves them into monthly folders — step by step,…
Read article →Linear Regression in Excel with LINEST, SLOPE and FORECAST — No Add-ins
Linear Regression in Excel with LINEST, SLOPE and FORECAST — No Add-ins
Machine learning starts with a straight line. Fit a regression in Excel with SLOPE, INTERCEPT, RSQ, LINEST and FORECAST.LINEAR, and learn how to read…
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