COUNTA is a Sheets function that looks at a range of cells and outputs how many cells in that range have anything in them. In this case, the pivot table displays the number of cells in the Face ...

Pivot tables in Google Sheets summarize smaller sets of data from a more extensive dataset and can be sorted by rows, columns, values, and filters.

You can enter data into a Microsoft Excel sheet or run a bit of M code in Microsoft Excel Power Query when you need to create a table.