Google Calendar and Contacts in Nextcloud, full access to edit and create

I have Nextcloud 16.0.4 and Calendar and Contacts App installed.

Now I want to sync my Google Calendar and Contacts to my Nextcloud server. Not the other way to sync my calendar and contacts to Google! But I cant find any useful how to. And WITH the rights to edit and create.

Is there any step by step docu how to configure my Google account for Contacts and Calendar and then which URL/WebDAV/CalDAV/etc. is to use to beam my data to my Nextcloud server? Is on the side of Google the API function to use and what is to do if so? The Google docus are so… fine I cant understand. :wink:

Very often the search function of this forum helps to get questions answered :wink:
The following Google related questions have e.g. already been asked/answered in the past: