Calendar and emails

[mcDcall]

I'm sorry for the maybe stupid questions...
Can i setup a caldav calendar? I have a nextcloud instance and i would like to set up it's calendar in twenty.
Can i create a calendar? If i can't setup a calendar besides google, can i create one? I see a lot of Rest api endpoints...
Can i setup my company email in twenty? How? (I only see to connect google account)

Thanks in advance for your reply.