Start by finding out what causes the cat to experience stress. Long-distance transportation has a greater impact on cats, mainly because cats suffer from more irritations, such as odor irritation, road bumps and motion sickness, etc., let the cat stay in their familiar air box first.
For new cats that have just been brought home, prepare a separate room for them and have a safer place where they can hide. And prepare something or toys that it used before, and these familiar things can help it relax.
When it is found that the cat has a stress response, do not disturb it, take away the inappropriate things in time, let it slowly adapt to itself, and wait for the cat to take the initiative to find comfort.