Stop hunting through documentation for the right nested function. Describe what you want to calculate in plain English and get a working formula for Excel or Google Sheets, with an explanation of how it works and notes on the edge cases that usually break it.
Name the columns involved, e.g. 'column C', 'column A'.
Your result will appear here.
Often yes. Sheets has functions Excel lacks such as QUERY and ARRAYFORMULA, and separators can differ by locale. Pick the right mode.
Yes. Use Explain a formula mode and paste the formula to get a plain-English breakdown.
Usually mismatched ranges, locale separators (comma versus semicolon), or text-formatted numbers. Mention your locale and the error message and try again.