It depends. If the damage is small, then you may only need to repair it. However, if the damage is extensive, then you may need to replace it. If you decide to repair it, make sure that you use a high-quality patch kit and follow the instructions carefully. If you decide to replace it, make sure that you use a high-quality drywall and follow the instructions carefully.

It depends. If the drywall is only cracked, then it can be repaired by patching the hole and painting over it. However, if the drywall is damaged beyond repair (e.g., there are large holes or water damage), then it needs to be replaced.