Return Cell Address for Active/Selected Cell

I have a very very basic understanding of VBA, so having a ton of trouble executing with codes from other solutions.

What I am looking for is the ability to return the address of a selected cell for use in either a) a forumal or b) in another cell

So for example, ideal situation for me would be to have in cell A1, the value of a selected cell.

I select cell B2, cell A1 would populate with the text "B2"

I select cell AX145, cell A1 would populate with the text "AX145"


Basically, my vba skills are so basic, I would need the full script to copy and paste...I'm not even really sure if this is a worksheet change or some other form.
Please help! Anyone!

Thank you

crazy fast...amazing! THank you so much for the assist!