How to configure a domain in Apache via SSH?

Question

Apache HTTP Server

Hello!
I will say in advance that I had no business with VPS or cloud hosting before.
Actually there is a cloud hosting.
1 server. It has VestaCP installed.
2 server. Without any panel, but all the necessary components for operation are installed manually.
1 question.
How to change the domain parameter on a server with VestaCP via SSH.
The domain has already been added to the panel.
You need to configure mask support in Apache, that is, write the
ServerAlias *.domain.com
Apache Config specified in the vestacp documentation

/etc/apache2/apache2.conf
/etc/httpd/conf.d/*
/home/$user/conf/web/apache2.conf
/home/$user/conf/web/sapache2.conf (ssl)

2 question.
How to simply configure a domain via ssh on a server without a panel?
Add new and change old?
And what can I see, read, in order to start working normally via ssh? And then plainly, except how to restart / stop apache I do not find it.
Thank you for your attention!

Answer 1

I figured it out myself with the help of console commands + vi, which I edited.

Answer 2

vi is, of course, true and hardcore, but mc is both faster file system navigation, and the built-in editor (mcedit) is more human (imho)