Previously I already got my VPS registered on linode, got the domain from namecheap, and DNS configured.
I rebuilt the linode VPS from Ubuntu 18.04 LTS Image, and then following some tutorials linked below:
https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-18-04
To add a sudoer user, I did the following to skip entering password when executing sudo:
# useradd <user>
# passwd <user>
# echo "<user> ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/<user>Then to install WordPress:
https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-with-lemp-on-ubuntu-18-04
Also as the tutorial mentioned, I set up the LEMP stack and SSL with Let’s Encrypt first.