Should and would are helpings words, modal auxiliaries. A modal is a verb that combines with another verb that indicates mood or taste. They have different meanings and uses.
Should is the past tense of shall and is used to indicate obligation, duty, or correctness (particularly of someone’s action). Example: You should not eat too much spicy foods.
Would is the past tense of the modal verb will. it expresses a possibility, an intention, a desire, a custom, or a request. It indicates a consequence of an imagined event or situation. Example: Gina would get an upset stomach if she continues eating too much spicy foods.