Hey
@Jay I had the same issue. I also could not find any tutorial neither on
cal.com nor anywhere else to set-up caldav calendar connection.
Eventually I got it working by doing the following:
1. go the calender view/app in your Nextcloud or caldav instance
2. select the specific calendar you want to connect to. In my case it was my personal calendar
3. Click the three dots next to it and click "copy private link"
4. fill that link into your
Cal.com setup for caldav. The Link should look like this:
https://yournextcloudprovider.com/remote.php/dav/calendars/youruser.name@email.com/personal/
5. Last you enter your username and pw and that's it.