Mechanics - Basic Rules - How Rituals Work
Rituals are specific pieces of knowledge.
A character must learn, (or develop), a specific ritual before they can use it.
A character must have occult skill equal to or higher than the dot of a ritual to use it.
A character must be able to use an enabling power of dot equal to or higher than the dot of a ritual to use it. This means may need to raise Release Level to cast rituals. A power’s listing in index will contain a note if it enables rituals, and which Tradition of rituals it enables.
Rituals are listed in sets, one for each Tradition. Traditions are the bodies of ‘knowledge’, belief, perspective, etc which make up the logic of why rituals work.
Even though different traditions contain very different world views, occult skill derived from studying one tradition will allow a character to understand rituals from another, (with maybe a little research effort).
Each Tradition is usually based around a particular enabling power (eg Obtenebration enables Abyssal Magic). This power is suitable to enable casting of all rituals from the Tradition it is associated with. Different powers might, but probably don’t, enable casting of rituals from that tradition, (storyteller judges on a case by case basis).