Automatic transmission cars require certain precautions to ensure smooth and safe driving. Here are 7 things to avoid doing in an automatic transmission car. Firstly, never shift into "Park" or "Reverse" while the car is still moving, as this can cause significant damage to the transmission. Secondly, avoid revving the engine before shifting gears, as this can put unnecessary strain on the transmission. Thirdly, it is important to avoid shifting gears from "Drive" to "Reverse" without coming to a complete stop. Lastly, refrain from leaving your foot on the brake pedal while driving, as this can lead to excessive wear on the transmission.