How to "attach" a domain I have on Google Domains with my VPS

Zitat von IoSonoPiero

Do I have to do something else on SCP or CCP to "connect" the IP with the VPS, or it's over?

Since your domain is managed externally, you don't need to change anything in SCP/CCP.

However, you need to configure your web server so that it actually answers to requests using your domain (let's call it "example.org"). It is more or less considered mandatory that users can connect to it using a secured connection (https protocol, using port 443), so you'd usually redirect connections using the http protocol on port 80 and install/regularly renew an SSL/TLS certificate. Also, you should ensure that not only the domain "example.org", but at least also the subdomain "www.example.org" points to your server (you decide which one should be the primary one, the other should redirect in order to not serve the same content under two different URI). Depending on the installed software, how-to guides addressing the above should not be hard to find (not necessarily on the Netcup Wiki, though, as these are generic tasks not related to the services a hosting provider offers–the idea behind renting a VPS is that you're in full control, after all).

Zitat von IoSonoPiero

because I'm following a tutorial

I think you should link to the tutorial you are reading.

That way we could see better at what point you are struggeling with adapting the tutorial to netcup.