Find the cell changed via app

Hi guy,
when I change a field of a sheet record via app (Ex. name) I need to undestand the exact cell (not row) that is changed in the sheet and compare the new cell value with an other sheet (same spreadsheep) column field and if true call a my function in apps script.
How can I do it?
I tried to use OnChange but I canโ€™t find the cell changedโ€ฆ
Thanks

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