I set just one session key as a validator at the setting stage.
The “inject session keys(advanced)” feature in the dashboard(Polkadot/Substrate Portal) shows many key types such as Babe, Grandpa and I’m Online…
I want to test this feature to prepare for various unexpected events 
that could be happen in the future.
Please, give me some details about this.
and how the result bruh?
Super hau boss… Awesome
what use of it bro? is that something important or not?
We don’t officially support the polkadot interface and removed it from our docs with that in mind. There is a mention of a similar action in the official polkadot docs:
There are additional considerations because the type of key required for each field is not all the same. Grandpa uses ED25519 and Imonline/BABE use SR25519
