I need to configure my server, but I've never used linux before, I only know how to code websites. I am willing to hire someone but don't know where to look or what to look for. I tried to do it with help from the forum but it's taken a long time and I haven't gotten anywhere.

• I need to make sure everything is secure (probably just configuring the firewall)
• And make sure the server only works with my domain (it's currently being pointed y another domain and I don't want that to be possible)

here is my past thread for more details: https://www.digitalocean.com/community/questions/website-being-copied-block-any-other-domains-from-using-my-server?answer=34740

Ubuntu / Node.js / Express / PM2 / Mongo