When working with functions like VLOOKUP, XLOOKUP, or MATCH, Excel often returns a #N/A error if it can't find a match. These errors are expected in many workflows, but they can be confusing to users or disrupt downstream calculations. Enter: the IFNA function—purpose-built to handle #N/A errors only while allowing other types of errors to pass through untouched.

The `DATEIF` function in Excel is a hidden gem, designed to calculate the difference between two dates. Despite not being widely recognized, it is effective for determining the number of days, months, or years between specified dates.