nasa-prj https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-20-04#step-5-%E2%80%93-setting-up-server-blocks-(recommended) https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04 https://auro.technology/blog/configuring-multiple-subdomains-on-an-nginx-webserver