The motor in your car is attached to the frame with special mounts. They can break. When they do the engine is no longer held in the proper position. It can then move more than it should. That additional movement can damage transmissions, drive shafts other motor mounts etc.
It can even cause problems with electrical connections etc.
It would appear that you are having a problem and someone suggested a possible motor mount issue. I would suggest that you give us the whole store including Make Model miles and Year of he car, what engine and transmission it has, what symptoms you have observed etc. and history of repairs accidents etc.