Cerificate, info

I am a newbie… sorry…

I need information about certificate generation:

./certbot-auto certonly --agree-tos --email YOUR_EMAIL --standalone -d YOUR_HOST

email YOUR_EMAIL
What email should I enter in this field? Is the same in the mail.properties file?

-d YOUR_HOST
is the IP address of the server?

Thanks

email is easy… yes, use your same email… as for the other, based on how I interpreted it, unless you actually have a domain of your own you can use, it looks like you simply use myhost.com