Does it help to have a generic boilerplate contract (jurisdiction-wise) signed by both buyer & seller for such transactions, where the buyer would sign that the

Does it help to have a generic boilerplate contract (jurisdiction-wise) signed by both buyer & seller for such transactions, where the buyer would sign that they have inspected the item to their knowledge and assume full responsibility of the purchase, and that they won't hold the seller responsible for blah blah. At the same time, the seller assumes that they have given up ownership of the said item for whatever money they've received in this transaction ?