I think you would learn a lot by using Excel Help or just doing a web search on the COUNTIFS function.
This function counts the number of values range, including only those values in where a set of conditions is met.
Syntax
COUNTIFS(criteria_range1, criteria1, [criteria_range2, criteria2]…)
The COUNTIFS function syntax has the following arguments:
criteria_range1 Required. The first range in which to evaluate the associated criteria.
criteria1 Required. The criteria in the form of a number, expression, cell reference, or text that define which cells will be counted. For example, criteria can be expressed as 32, ">32", B4, "apples", or "32".
criteria_range2, criteria2, ... Optional. Additional ranges and their associated criteria. Up to 127 range/criteria pairs are allowed.
IMPORTANT Each additional range must have the same number of rows and columns as the criteria_range1 argument. The ranges do not have to be adjacent to each other.
In your formula, it is counting the number of rows where all these conditions are true (I didn't include the sheet reference but that part is obvious):
The value in column A match the value in A12
The value in column B matches the value in D1
The value in column K matches the value in A2
The value in column C is "E"
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