1> Arguments that are numbers, dates, or a text representation of numbers (for example, a number enclosed in quotation marks, such as "1") are counted.
2> Logical values and text representations of numbers that you type directly into the list of arguments are counted.
3> Arguments that are error values or text that cannot be translated into numbers are not counted.
4> If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are not counted.
5> If you want to count logical values, text, or error values, use the COUNTA function.
6> If you want to count only numbers that meet certain criteria, use the COUNTIF function or the COUNTIFS function.