Automate barcode scanning into an inventory sheet to add to actual inventory and subtract

Good Evening All,

I am by no means very knowledgeable at Excel but I'm giving it everything I have to learn and understand it.

I would like to have two cells on my sheet that I scan into based on if I'm receiving finished goods or shipping finished goods.

If I'm receiving finished goods I would like the sheet to add to the actual inventory.
If I'm Shipping finished goods i would like to subtract from actual inventory

I would also like to know if after the inventory has changed if the cell that I would be scanning to can reset itself to scan another or if i would need to integrate a reset/delete button to scan another?

Any and all help would be very much appreciated.

Thank You