1. How to change hostname

The hostname of a linux server is the name other computers on the local network will see.

To update the hostname enter the following command: hostnamectl set-hostname your-custom-hostname

To check if it has updated, sudo logout and log back in.

Also go and check out the /etc/hosts file: sudo nanpnano /etc/hosts

And also go and check out the /etc/hostname file: sudo nano /etc/hostname