I Killed Database Functionality | Need to Fix

ok, just so you know, I am an absolute novice at anything in a terminal. This HestiaCP installation is my way of learning how to run HestiaCP, because I really love it. I’ve willing to learn. However, I just want to ask:

systemctl status mysql

Is that a command I can put into terminal?

I know how to ssh into the server.

Also, I hard reset the VPS a few times. Would that not reset mySQL if it was off or not functioning right?