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Forget INDIRECT: The modern way to create cascading drop-down lists in Excel

Use dynamic arrays and tables for fast, scalable cascading drop-down lists in modern Excel.

Create Dynamic Excel Data Validation Lists Using Table Spill Ranges

Excel validation lists avoid blanks and errors with TOCOL(ignore) plus FILTER; the spill range stays stable across worksheets.
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Use an Excel array function to create an AverageIf function

Use an Excel array function to create an AverageIf function Your email has been sent Excel doesn't have a built-in AVERAGEIF() function, but you can still average values, conditionally. Excel has ...