IFERROR(...)

Category: Logical

Returns a value you specify if a formula evaluates to an error; otherwise, returns the result of the formula

IFERROR(value, value_if_error)

Category: Lookup and reference

Returns a reference offset from a given reference

OFFSET(reference, rows, cols, [height], [width])

Category: Statistical

Returns the k-th smallest value in a data set

SMALL(array, k)

Category: Logical

Specifies a logical test to perform

IF(Something is True, then do something, otherwise do something else)

Category: Lookup and reference

Returns the row number of a reference

ROW([reference])

0