If they leak, first turn the hoses to tighten them. If they still leak, you may need a new rubber washer. The washer is a little black rubber circle that fits inside the hose fitting to seal the hose. If you have a problem with the water being hot when you select cold, the hot and cold water hoses are probably connected to the wrong water supply. Take them off and reverse them.
Right side is cold and left side is hot.
Make sure you turn the water supply valves off before you attempt to switch them. The first time you use the washing machine, the water will be hot from the pipes sitting in the hot weather. Don't put a cold item in the washer and expect to have cold water. If you notice a hot, dry, smell everytime you run the dryer, check behind the dryer and make sure the hose is still connected to the back of the dryer and to the wall running outside. If the hose does not have enough room and becomes crimped, it may cause the dryer to overheat and become damaged.