In general, shorts should be washed in cold water to prevent shrinking and color fading. Use a mild detergent and avoid using bleach or fabric softeners, as they can damage the fabric. When drying, air-drying is the best option to prevent shrinkage and damage, but if using a dryer, use a low heat setting. To avoid wrinkles, remove your shorts from the dryer as soon as they're done and hang them up or fold them immediately.
