Most people wash with warm, rinse with cold. Most things do not need to be washed in hot. As for the dryer, if you use a high heat then it will dry faster, but things that have logos and such, not the embroiddered ones will get damaged easier. So I usually dry on low heat. Though it may take longer, I like it more. Especially with bed clothes.
first of all thank everyone for their advice.
but about logos (such as band tshirts), i heard if you wash and dry them inside out that they last longer. i find this to be true.