trigger a macro when changing a cell

Hi all,

well i'm trying to create a code to run whenever i input a value in a specific cell.

i think i should write this code inside the sheet module as a private sub, just like

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just make myself clear, i'd like to run a code whenever i input a value in cell A1.

i appreciate any suggestions.

thx
MSP

works perfectly vba noob.
made the ajustments to fit on my demand but the main issue is solved!!
many thx for the wise tip!!