Attempting to define content in cell based on update of other cell in same row.

I am a newbie at programming. I am trying to modify (clear) the inputs in column C, D, H & J if the input on column A is changed. the following snippet of code works for the first row but does not for subsequent rows.

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I've determined that I need to put a loop and check if "Target" is in a range "column A". I've modified the code to something as below from my research online. From what I read on the internet it should work but I am having no luck. I would appreciate some feedback.

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Thanks in advance
Yves

Everyone I figured it out by reading a book.

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