Learn the difference between Excel COUNT and COUNTA, plus TEXTBEFORE and TEXTAFTER tricks, so you clean text and totals with confidence.

Upgrade from static snapshots to a live-updating system that handles complex repeats with ease.

Learn how GROUPBY passes both subset and full arrays into LAMBDA in Excel, letting you compute percent shares fast and explain results clearly.

For years, I've relied on running totals in Microsoft Excel, but the traditional methods are fragile and unreliable. Since Microsoft introduced the SCAN function, I've switched to a brand-new approach ...

Large rooms (that is, 300 square feet or more) can pose a unique heating challenge in the winter: Features like high ceilings, hard-to-reach corners and spotty insulation greatly factor into which ...