How many kinds of bus pass are there in LA?

-I heard in LA, they have like CTA pass, you can use on CTA buses. I also heard there are MTA buses and municipal buses. You can use Metro Subway daypass on MTA buses and a few municipal buses. Does it mean CTA pass doesn't work for MTA buses. In spite of the few municipal buses that you can use MTA pass, you need to get a different pass for other municipal buses. Is that right? How many kinds of bus passes are there in LA? Do you need to take 3 or 4 bus passes with you to travel around LA? Thank you.