What rituals do you personally find very dangerous? There are a lot of rituals. Some that we don't even know yet. And some which are super risky. Share some of those ones that you think are super risky.

For me it's goetia and exorcisms(there would probably be more on my list). Goetia mostly works with daemons, and not all of these 72 entities are nice. Exorcism is the riskiest thing(in my opinion) you can attempt if you don't know 100% what you're doing. IF it is an entity possessing someone, it won't let go easily, And often try to psychologically torment you. That's why exorcisms are often done by highly experienced priest. And someone could mistake mental illness for demonic possession most of the times as well. It happen in those early days very often.
But anyways, for me I know goetic invocation and exorcisms are 2 nasty businesses. How about you?

I think that every ritual where you summon someone/something is dangerous. It doesn't matter how you have to summon it always has a risk. You never know 100% who you are talking to, the thing can promise you anything, that thing can go to your body and there is possibility that the thing doesn't go away it stays in a place you summoned it.

I agree. Some people do it as a part of their religion though(such as Hinduism or Christianity).