2014 Toyota Camry Axle

I purchased a used vehicle. Took it to a mechanic and found out that there was an accident on the vehicle from the front passenger side. When the vehicle was mounted, it was noted that the axle and other components surrounding the axle were from junk parts. It would cost me nearly 1K to fix it at a Toyota dealership. My question is what is the axle for and is there a permanent damage to this condition even after it is fixed. Perhaps, is there a chance that other components will be damaged too as a result of the damaged axle. I could see oil leaks and dripping from under the car. The mileage is 8000