Excel has 100s of functions. Most them are not useful in day to day business setting. Here are the 10 most useful functions based on my 15 years of regular usage.
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1) SUMIFS
Use it to add up values that meet one or more conditions.
=SUMIFS(A1:A100, B1:B100, "NZ", C1:C100, ">20") adds up all values in A1:A100 where column B is NZ and column C is more than 20.

2) XLOOKUP*
Use it to lookup a value and get corresponding value.
=XLOOKUP("Widget10", A1:A100, B1:B100)
looks the code Widget10 in column A and returns the price in column B.
* Works in Excel 365 / Web only

3) FILTER*
Use it to filter a list or range based on the conditions. Returns a range of values and automatically spills the values into next cells!
=FILTER(A1:C100, B1:B100="NZ")
returns the entire range of A1:C100 where column B has NZ.

4) COUNTIFS
Use it to count items that meet one or more criteria.
=COUNTIFS(B1:B100, "NZ", C1:C100, ">20")
tells us how many items have column B as NZ and column C more than 20.