Don’t take radical evasive action to avoid a collision with a deer as this is more likely to cause you or others harm.
There is no way to know which direction the animal will run. If you have time, flash your headlights and use your horn to try to scare it out of your way.
If a collision is imminent, brake with your steering wheel straight. At the last possible second, steer away from the animal’s midsection to prevent it from coming through your windshield.