My copper tubing for the water line to my refrigerator became slightly bent while I was installing it is it a big deal should I buy new copper tubing?
Depends on how slight you mean by slightly.
Copper work hardens, so every time you move that line it will become stiffer and more prone to kinking. A replacement copper tube will be "dead soft" and easier to work with. If you have the fridge back where you want it and the kinks have not produced a sharp spot (a flat is okay) then you're fine. You might want to buy a replacement to have on hand if you have to move the fridge again.