If you intend to lift the entire car up on jackstands, do the front first, one side at a time, and then do the back. If you raise the back of the car first, and then start lifting one side of the car on the front, this will also lift the car off of one of the jackstands in the back, causing the car to slide off the jackstands and land pretty much on it's side. Not such a good thing to have happen. When you are taking the car off of the jackstands, lower the back first, then do the front one side at a time.
Most folks have enough sense to figure out that they shouldn't try to put a car on jackstands in their yard, or any other place that is dirt or grass. It is not immediately obvious that you also shouldn't do this on asphalt. Do NOT place your car on jackstands on an asphalt surface, like the one you find on many parking lots and streets. The feet of the jackstand will pierce the asphalt, slowly sink in for a little bit, and then drop the car on you. Don't be 'That Guy' that people tell the story of.