Configuring firewall in VPS when using Docker Machines — is it necessary?

Hi, everyone!

In continuation of this vital topic, I have a question about firewall setup.

I got VPS and successfully deployed my project via Docker Machines.
Now I think about what following steps about VPS setup should I do.

The first thing, as I understand, is about closing unused ports in the firewall.
I see that my app is fully working, that means the allowed ports are open.
And I have checked some unused ports with help of https://portchecker.co/ and they are all closed.

That means, all the things about ports are already settled by Wappler and Docker, right?