Some of the important Excel formulas and commands are as follows:
Column to comma-separated values
=TEXTJOIN(",", TRUE, A:A)
Select entire column
Ctrl + Space
Look for value from a column in table or list
=VLOOKUP($A1, list2, 2, false)
=VLOOKUP(A2, G:G, 1, 0)
=VLOOKUP(A2, J:K, 1, 0)
Conditional IF
=IF(A2<>A1,"LAST","")
=IF(E2="Override", $B2,"")
Return count of cells equal to a specific value
=COUNTIF(range, value)
=COUNTIF(A3:A12, "blue")
Sum of values in column
SUM(A:A)
Count unique values
=COUNTA(UNIQUE(A1:A12))