The korbanot section in the daily siddur (Zevachim 5) describes the types of korbanot, where they were offered and the level of holiness of each type. Why are ashamot (guilt offerings) of greater holiness than pesach offerings (kodshi kodoshim vs kodshim kalim)? The Pesach is required of all people, annually. An asham is only brought by individuals who have sinned. Why is my naive conception of holiness (brought by everyone annually being more holy than individuals seeking to atone for sins) wrong?
This question asks about the meaning of the term holy, in one practical application.